Antonio Cipriano José María y Francisco de Santa Ana Machado y Ruiz (26 July 1875 – 22 February 1939), known as Antonio Machado, was a Spanish poet and one of the leading figures of the Spanish litera
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 0x4456455ecb1ca6ff95ae65985fca4055d3478db622da107416c0c608bcee9524. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b624d2ea-7cc2-463f-b9fd-4f7b433c15c4.json and https://artists.proofprofile.net/proofs/artist/b624d2ea-7cc2-463f-b9fd-4f7b433c15c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).