{
  "manageEntity": {
    "action": "Save",
    "entityId": "502992975",
    "entityType": "Track",
    "nonce": "0x7a62f545d1826df132736bad159b95e86762e30cec663daf0a59becb90ebcfc1",
    "signature": "0xfade6c098021b8e6433a4764e7cc5db34ef953843286cec43e9af26feb0447b97748fe713509153e419077cfdb8887017ee2fa6913b1d0352853c2d95e86fad21c",
    "signer": "0x03e9Caf2aeac5a0F0e4Be56410d67A4148D38Fd4",
    "userId": "47828528"
  }
}