{
  "manageEntity": {
    "action": "Save",
    "entityId": "649069",
    "entityType": "Track",
    "nonce": "0xaeb9744d037c72e87d7ff951dd3beae4bcfdf5507bf45a5352c25e6f68346de7",
    "signature": "0xc58e1e8c34ebbb9ed46304d573b9b57cf93f02299ac2152658ed0044105179c923866e49b8d35d75b15d6d91c5a1fef536d63848bb44bbf06b2113a25211ed831b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}