{
  "manageEntity": {
    "action": "Save",
    "entityId": "560481",
    "entityType": "Track",
    "nonce": "0x66d7c129d7cdeba645aab39ab709cf4a917d1f26bf1fb65ea2c43d2a33bbc568",
    "signature": "0x5fa912b7a69c857a2b1b4da1fbefd7751975b4244801c823597752bd26150d250144b0ab277c2ffbe8b534f9e151cc6c8ea31bd92928f01ce38912144b8e632f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}