{
  "manageEntity": {
    "action": "Save",
    "entityId": "1807637418",
    "entityType": "Track",
    "nonce": "0xda5c8969e75b3016ca9271de7e78ada87a6872781fcd1f0c92bdac16ca7f2719",
    "signature": "0x3885a6b4a7e38a800cb8ffc5e7d39065db184d40175dbb002d35edf867e925e435b4e5e7ecaf4173390226669a794bd8285704ab531baa1b0d57fff8db1283441c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}