{
  "manageEntity": {
    "action": "Save",
    "entityId": "148009165",
    "entityType": "Track",
    "nonce": "0xe132559959f7255ee7b19003308faf29afa5eeacbcfe05590e88f73293c8cce2",
    "signature": "0xaf74b02341c8e5b53b8900f8884702a48bb8e65066264add6507b5db0d5b267877399f552b6a04c92928afe5e89b9b79647500eec4fbe2b9ff7d8bb4464f9f7b1b",
    "signer": "0x9765cbE8e26a2c6c4847C1B69ABeB0B5250EC254",
    "userId": "678556080"
  }
}