{
  "manageEntity": {
    "action": "Save",
    "entityId": "144578864",
    "entityType": "Track",
    "nonce": "0xef18ccb1a7c34458f54ff46b2fe977c0530b086a502aee54ba83db2560a2d9dd",
    "signature": "0x8d3779cbf68d3186146c1ca6ed84f00fdb49a0b6919e53ab699fe3492a6fe2823343b73b2747beb74aacb7638e29cc43f5afe2cd981ff5988f0eedbe634a6e5f1b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}