{
  "manageEntity": {
    "action": "Save",
    "entityId": "261739550",
    "entityType": "Track",
    "nonce": "0xdb6d6e618939c52b3774622724df86e2a79fcf84bb0c5d24fae19cf60f0f9fba",
    "signature": "0x6bbf240c974b916351cd6d438f31bcc75e9901bb65405d8227c9f750b88257dd3f01dae75d512471937cc7cf8d39a1753c02aac64784e79abc0f0f498bbb0a401c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}