Metro may refer to: Geography Metro City (Indonesia), a city in Indonesia A metropolitan area, the populated region including and surrounding an urban center Public transport Rapid transit, a pas
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb258692f3f2e79738528725c23bf6d50ec11a6d3a03a3f384ae39613e80ab8c8. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/172a63f4-8f0b-4218-b762-f0b7067305cd.json and https://artists.proofprofile.net/proofs/artist/172a63f4-8f0b-4218-b762-f0b7067305cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).