{
  "manageEntity": {
    "action": "Save",
    "entityId": "509338378",
    "entityType": "Track",
    "nonce": "0x1259761b0616759a1627e5decafc2a8ad9d84600905992ac0a9691e49b3a5e67",
    "signature": "0xc904f7b9c003d47b61e195fe97b4eb38b14fc481039f98bdc89932a13cfbf6956d3bb5d286c2471fce9f64bd6bf08a73c23acf502f26bcc9e5fb3c17b27618661b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}