{
  "manageEntity": {
    "action": "Save",
    "entityId": "1123397579",
    "entityType": "Track",
    "nonce": "0x60a671f76a76ba8b5d15571da3369db58eac380e3dad2ae03e43857451a1a8e3",
    "signature": "0x85f411c2654b117b7a2f81bca07f0293c33e0cec4913d100b6c2c39266dc81873b972895823464786295b70cf9dbcc28e3ffb35ecf9a581edfd0bd5bba5bcf9c1b",
    "signer": "0x879AB09f06df488AF471eeBA6489678312560024",
    "userId": "903958768"
  }
}