{
  "manageEntity": {
    "action": "Save",
    "entityId": "1674001840",
    "entityType": "Track",
    "nonce": "0x607e9086f2b2b17ce009b4681de01bb5ab6e215222031ec5337b2285096f7eb2",
    "signature": "0x44301096085401d49ae4b60994122b6be0c9d48495bd827cfebcd3075ae81ff520d4724294e9602dbd8b88a5734036c32e8e9d9ea2b7c871e7290f0d52f1e66f1c",
    "signer": "0x5D4848bCf5c4abA1a0Fdf2B61408c9e4288aDb0E",
    "userId": "305415280"
  }
}