{
  "manageEntity": {
    "action": "Save",
    "entityId": "568762",
    "entityType": "Track",
    "nonce": "0xd038ebaf22b2c4973f17055375c49a9b4e691f301a7987eba066e4747e61a985",
    "signature": "0x6435615d8f9d664859925e6340a345c46d6496834f93614a4966f31e2d4bd96f1929978ec07a12694548cb32c9c0c1a01bf93fea57d03de103f64f200fecc4b61c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}