{
  "manageEntity": {
    "action": "Save",
    "entityId": "1458215801",
    "entityType": "Track",
    "nonce": "0x94ef2a13e1f299ad79da32ca0100955088cf2d57502962f516f975308344cf9b",
    "signature": "0x508a0ebeef95f8527f3e8ef4545865c4b11e637a70762d7c4b21047516fd59a705b935d77426a35a70d123310882fb8d70e96cd3c0f8581234d4c2c536b5022e1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}