{
  "manageEntity": {
    "action": "Save",
    "entityId": "840125247",
    "entityType": "Track",
    "nonce": "0xe4e96c4345dd24ae3d02b9266343be2f6275190dbd6277df6e3859f5e9d638d6",
    "signature": "0x12141fc2cf47a31c9fe256a25bef953bc823a52e5eab3cca24e2eed11cbd2b2f25e5abbf0b027d3fa1d14619bf75a0f9448908b996f73c4078567ee7d970e4a21c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}