{
  "manageEntity": {
    "action": "Save",
    "entityId": "1378179653",
    "entityType": "Track",
    "nonce": "0xd74c438f0c206006894c624ec2149f26a491b4342e00aa6d360924e4a947b433",
    "signature": "0xbd69f82bad7fd3bb104dc28f9fdde93b3d5ae3711b0fa3d5f49746ccde603e5f1f59c6eaa932d6273f4d12448f0229b59bfe1b096bf98c8639deaf71fa69c9441b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}