{
  "manageEntity": {
    "action": "Save",
    "entityId": "508618",
    "entityType": "Track",
    "nonce": "0x954ddd9e6881fdff10137cea849b029aab1471acd2e0dfbf075f7e2cd1dc5f1c",
    "signature": "0xbe95a6d1f100416aae42f87e7dacc96d2ffbf5e074b2b0556a4ea40b2ecaadd20132802bcae781739a8ceaa0e243c6ae3b5c0d168e435692cea557e20580cde51b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}