{
  "manageEntity": {
    "action": "Save",
    "entityId": "377539399",
    "entityType": "Track",
    "nonce": "0xf590d2ccbec23d61c6760f9e6098d48296f9a8c85e3945d500cf2add2ce0a36a",
    "signature": "0xa0f8ce6fbc2df999571f3d92a9d4673091cd111ad3a092393cf8fc5f07afca9e4fbd304d5b499ff18aa2e66435a9ee80e3c0f0f5b163273c9ef68b8d4da03a441b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}