{
  "manageEntity": {
    "action": "Save",
    "entityId": "622833",
    "entityType": "Track",
    "nonce": "0xb16db088f273d0879319840b8a337e6e3c3a3fe72a37a6742b4d873b848b5e2b",
    "signature": "0x010833a77c48ec45ddb55a62a96db01c0b04b77db93731238199e3fa64f4099609b0407230e81987a80833ed22e5801c2f5c51e2467fff224a8fa06c2b28cdcf1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}