{
  "manageEntity": {
    "action": "Save",
    "entityId": "210149",
    "entityType": "Track",
    "nonce": "0x2ddfefb107363d2edd63fb4091898805bd2291689dc9766ad1540ef3da53cae2",
    "signature": "0x755011945adaeb7f29d1939b5b78f1affbffc68696af522c566b1a3fe2e608802e6a38feef3d1c4eb8526e9a47d1cde22b2f1549038f70e1df75b7ddd8d96b151c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}