{
  "manageEntity": {
    "action": "Save",
    "entityId": "551323",
    "entityType": "Track",
    "nonce": "0x3ce7a2f5a9625283e2ae03264f1e0174a8df3359eb141b3899664dc055e800fe",
    "signature": "0x973ad21f648c3384b72e940f2ac96603108e74a351a330b1a975bb1e96ad0bb16a56d8c350d6b524b00a04ca1deda420c57856e61f1f5224a06083aafaec59191b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}