{
  "manageEntity": {
    "action": "Save",
    "entityId": "557303947",
    "entityType": "Track",
    "nonce": "0x72e2b29ebe6b3112fd4484a3fe3bf8f4369228f69663b18990f95e000c1605cd",
    "signature": "0x829c4540f448542be1b8fa9e2bcc8120db0ee823b90e3f0994b689ede9f9b78b0680ae9968dcd2809a6b334122585b36e8ca23d3f86ec146095343bda99012b51b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}