{
  "manageEntity": {
    "action": "Save",
    "entityId": "619483",
    "entityType": "Track",
    "nonce": "0x244dfa221ca17ed20fab3a867d7081f9aa20ebb999175a8b6465c3fd37f09221",
    "signature": "0x9fb9fe4d915c186c9f232da436cb05160aabfaebb293dfbcfe7e43ffd2a59bf75041dfeafcd238ebc1aa0129f43dab16aca50672d0caca0d7ad99a2f83ab2fc21b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}