{
  "manageEntity": {
    "action": "Save",
    "entityId": "152788",
    "entityType": "Track",
    "nonce": "0x153b1dc935a8e04602776206c85d7c0c1935d2313d02552b70f326c5d9fc502e",
    "signature": "0xc6111433e6ccd36fd8294d5cacfe0a23fd114253857a686d7cd77a35e2101640598d06536282ee7bec4c1c47619c682cef0992b5e27b06ec7b1ac7f2a3efa3eb1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}