{
  "manageEntity": {
    "action": "Save",
    "entityId": "121964273",
    "entityType": "Track",
    "nonce": "0x9443f14fc374fb652f06f9822517d36e59613bcace722a231ba39a36d562a34d",
    "signature": "0xdb6a647c7c0f95ffdf9dfa5d114353fcc4f17f16e77792be220cff5019f9630626a91acee227c1beb0699c4839889300acf8803633f06d53794e42c1f6b671a01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}