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 0x50d64c4b2e58fdebf4225c3bb8eaf4bc638fdc1c28406220b9bc29ab45fd8338. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df639b53-67f5-4b39-a5e3-9e7c85f4ad3d.json and https://artists.proofprofile.net/proofs/artist/df639b53-67f5-4b39-a5e3-9e7c85f4ad3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Puccini: Suor Angelica: "Sorelle in umiltà" (La Sorelle zelatrice, Prima conversa, La Maestra delle novizie)
Puccini: Il trittico (Il tabarro; Suor Angelica; Gianni Schicchi)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x58bb8b517f16606ebb6ace831eba982255ccfea0531f44bf6dd41da574b9bb20. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0801282.
Puccini: Suor Angelica: "Suor Lucilla, il lavoro" (La Sorelle zelatrice, La Maestra delle novizie, Suor Osmina, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa214c8cf1f312dd0200fa19da8f0746afeb0cb3dd769ce60c3c9c56d9780a271. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0801283.
Puccini: Suor Angelica: "Oh sorelle! Sorelle!" (Suor Genovieffa, Una novizia, La Maestra della novizie, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9a06ced7816f738a21e831eb816ec9fe4e0f440b3fcee5db2329802fd1e9f2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0801284.