{
  "manageEntity": {
    "action": "Save",
    "entityId": "1661621256",
    "entityType": "Track",
    "nonce": "0xfb9d4c1f275a7d18f1668ddd66a09d387242b10c5d0ab717d2c98d1e516262f9",
    "signature": "0x1d55ce9f57a40c47e6fc2f70c8470c5c68ee130257a64cd2c1c464d58a383625355b6c4add4d052e68de767355f05217bf3d2842688c454bf9b48bc8ecdf10111b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}