{
  "manageEntity": {
    "action": "Save",
    "entityId": "1537691968",
    "entityType": "Track",
    "nonce": "0xa72e986085d1bfb1d5ee6915ebdc8b54c4c1932d36e2e15cd27670c46fc2521b",
    "signature": "0x5b4ca876c401b2c3e9b3f6615a561049fb6fec7a3c4f976a0b2fb56bd61bbe606d0ccff26751b40800e2ca2f3046804bb92146e84353c9e3a40794a6a0118c601c",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}