{
  "manageEntity": {
    "action": "Save",
    "entityId": "761897322",
    "entityType": "Track",
    "nonce": "0x158f22b030fd7670874c21189b02b3e51eba0bf7199921ee48443c7c446087f8",
    "signature": "0xd438a1188ced49343e5946cbd3a808e2d16ebffc930e0457915c82ba277128fe5be29d69e6a7210263aea6d704ca65ac66565dd19a01c137c47c50ff94df15e51c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}