{
  "manageEntity": {
    "action": "Save",
    "entityId": "931896579",
    "entityType": "Track",
    "nonce": "0x6437f4a49283f686e2da7d5a5c5f9ec6c12bf4198bca2bca3618281406c6ef3d",
    "signature": "0xa549a78d6007e114d61a36f8d5fe9883f146430f7dee947fba165784e0a1180e03bd163afd1f2b43f912545fa4d8d1592358ed4baf108dff4bcab6e3c6a4db281b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}