{
  "manageEntity": {
    "action": "Save",
    "entityId": "1820446419",
    "entityType": "Track",
    "nonce": "0x513c17bd1d71b539d5aaf3b728188abac81c7694b5b232ba9751392f1430d2c4",
    "signature": "0x9c152f86dbce24115d374066a98dd420cbcee3c44410c9efcdbb6e8b8c67105e0268aa5842be59424a5b1477a68dbd7385751734216c7fa4af47e6e7103bda261c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}