{
  "manageEntity": {
    "action": "Save",
    "entityId": "1472458398",
    "entityType": "Track",
    "nonce": "0xd7e0bca47d56a2272d1beec31c111f794000bbbe4a1340d4712a81c8079495b8",
    "signature": "0x978273985746b99bc1086bcd1a867b178f2cc90cb65e6bcf7d66733d95f29b121b8d50228054dd473ddf5150583a4f65e891027f1e132a8682c8f591234981e21b",
    "signer": "0xB57F94Ef9a26d73E8b35D3f37FccD18BcC7eeE00",
    "userId": "850416615"
  }
}