{
  "manageEntity": {
    "action": "Save",
    "entityId": "520804479",
    "entityType": "Track",
    "nonce": "0x3735da0ea243094f6327320ad660b120086ca647d79754cc34ceee006b66c130",
    "signature": "0xe9f5b46ef0c365213b140b13c23db05e85a874c5eff8965ee8066018c3f19c131acba7cd3808c6b9bc581b7d4de8aec72a51f021c60f0fde743681123959e5dc1b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}