{
  "manageEntity": {
    "action": "Save",
    "entityId": "140420445",
    "entityType": "Track",
    "nonce": "0xb9f8c1ef05a92d135d4c346902a8a1fe9732c0f60d168074de0c346e65959d40",
    "signature": "0x40b5d954cd7b165f422ecfa2b10ae205d950edd63c637d335ab99c3893deeb2f74bcbbd9cfec0ff3ddfe4635f2eb41a84a61a74a2dbffd389b50befc62600c921b",
    "signer": "0x5aaD03EeeA903717f9a4E922505de7C75223d53F",
    "userId": "143226702"
  }
}