{
  "manageEntity": {
    "action": "Save",
    "entityId": "387950",
    "entityType": "Track",
    "nonce": "0xb9f876929b3d0db2ebee176353c402d21c23a1fa9d7ecc2da1107c2dd53896ac",
    "signature": "0x967c67214617205f93ce6d398b1dc61f80d2dc85dd32178736b6bd3f173f6fad57e9a74affe15c8233a8017822517c4a68b0a63523a8092eb8c0f415c652b7041b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}