{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990740931",
    "entityType": "Track",
    "nonce": "0xfd8cc8c28a7aa46ce238215a7d6b96e0fab9eb8576fdad7e2c3a34938e0bf864",
    "signature": "0x7a6be74830e7baf65ab2ec338caba709c14114f5caf4904241a90ee238a37f1f6f89dbbfd38da98206abd363a55f8092e6b1cd3d444390582e96260c35b27f271c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}