{
  "manageEntity": {
    "action": "Save",
    "entityId": "474540973",
    "entityType": "Track",
    "nonce": "0x4e3d6afd37d805158262da91f8a9f9b0c5eba8d5e2d128a136f59b2f2fc39008",
    "signature": "0xec28e321415c1a399daaeebfecf485d06b49158bfe86b192c6952709fed6dc8144ea45c5a795d8a394a9170095807772475ba11f6558fafb2ce107757bedd9a61c",
    "signer": "0xC56E1ccbA93c1E645e5F27Bf8A5ca13eB7A5eEbe",
    "userId": "335878078"
  }
}