{
  "manageEntity": {
    "action": "Save",
    "entityId": "257461965",
    "entityType": "Track",
    "nonce": "0x2811e74aaf455bb4c243de0e7e7a286767198a45de6f8c844593a092c527815e",
    "signature": "0x44a39f19b682c90da5231533c74637dc4933aaba42675cd0ac516d3cab99e59c7b2d048c8a6fdb97d1ec2f3953be5171a6e0f3040752b1bd826875969efe56a71c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}