{
  "manageEntity": {
    "action": "Save",
    "entityId": "472972807",
    "entityType": "Track",
    "nonce": "0xa6fa921c81d9ba2440eb10afde03e34163ff9a1f22446ce7f4b01f49da812ad5",
    "signature": "0x253b3874e656ac6ba3b8fb4a3d5bf81908219c87dfefa4de6779d67a5be7186970edcc3c1c08618fb55890b9b6622a4b0b632e185d58333545004325cb9fd8111c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}