{
  "manageEntity": {
    "action": "Save",
    "entityId": "423524544",
    "entityType": "Track",
    "nonce": "0xabb2e0f91462fad82a9295caed3e3bced3d8f0fca3d53da939b0a36ce39b9b5d",
    "signature": "0x9c5147d317bf144dd4133638a12b99c049028dc32f68a65818f3994a3f4efc2032fea8cc60096668235a604fb8830c222de4be4a303901ef0f3d67a3108c99db1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}