{
  "manageEntity": {
    "action": "Save",
    "entityId": "1213548060",
    "entityType": "Track",
    "nonce": "0xb51045e1773f14ce1cd9a50a3d3e5c2b8b33958f17c1e98bfa048354685d1386",
    "signature": "0x60cb025ef7dd9a6dfb72fb975710122be6f88ae7e590d84c2f8ed0cf0171af1d6e0f5f926fbe6d724b9ebcc95f6ab9ea9294dbd2095ef9e4d6cb70c68cab3c741b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}