{
  "manageEntity": {
    "action": "Save",
    "entityId": "221402",
    "entityType": "Track",
    "nonce": "0xfc254a8fa88c7ad6c2bf4c93e549320669af4d78ea3b16dd9c96a5ab3aa86e60",
    "signature": "0x1b357ba173262d445aa0b70ac39a6d7759aa7c20fd7ea18a3082aef26a30eb944c39567bf7a389bd901fc61123d78463840fb4cf337306d6f2bfeca9a3de290b1c",
    "signer": "0xe270C91f9476B885124d6c0208211213dC10036a",
    "userId": "94825285"
  }
}