{
  "manageEntity": {
    "action": "Save",
    "entityId": "674795464",
    "entityType": "Track",
    "nonce": "0x35f9a5420140a42f36f04c5984cf22fcc6722ef78f62449a20d652689f113d84",
    "signature": "0x601f0b58e55bb5d0a03de3127a8d504b38f6053bc53ff71be494a5deaadb65564ebf16e2d4a17baf34e4f6a1cc126ee82f46b64b65c78ed33ed70f61bdc4cbf81c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}