{
  "manageEntity": {
    "action": "Save",
    "entityId": "819898725",
    "entityType": "Track",
    "nonce": "0xeff076d9657df092cdc55c2361ad087b9dd61cbb5677ac6d2031ea3d1c18a0eb",
    "signature": "0x747414cfccc0aee7fcaec575e5a69eb52e6ffef4b2caaa574a75fbcfcddaa7ef4bc72ceebbb7c48f2fa84da5076b0d5eacf23f046f2d35a88ee177fd2370a8981b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}