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 0x2458048f12c60d6fe633d9c19e31ad8251f40291b3893c6dc47895655fac96c2. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a31ee07e-7f19-48ed-aac7-72fcdda02f4b.json and https://artists.proofprofile.net/proofs/artist/a31ee07e-7f19-48ed-aac7-72fcdda02f4b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x8b10e3c782e1265659cb18dbad747cb37572da7c2d3f4a0a1a5ea38ab4daf601. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZK6K2243590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccb57e7cfc585e254ec9f18e1da9fe6924451f41126800cc6921dd8e04b7f36. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ72392046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6b6c267e9155c06480ab9c339be1e335a0e8624db0731bee549449219eac19. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ72392047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a5809a96ef4452790bb94e3bcd74317536cbde96f3b6b39551b8c2312a244b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZFZ72392048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc847f35694a6065f7c805b3859d6a82eaa24ec77134e3e74841de87a96dd9b5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZFZ72392049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03862473da62fb373b76015fa565d6b2470ac74f20d91f7196faaa4aee029bc4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ72392050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5855c49e3f515080636c95c6fb108849e0e1718c44a75a3ec5b8b10e62333d. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USUYG1506683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3403502719d486d9ab8b7d43ab9faae6cc04bba0b57c78a88131f9c7424d952. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA62504309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d55fabd23dad280ba470aae15d8c2acf55cf7c53459e559ef6fb9fdfc723d4a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USLZJ2584219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9685551a0d42cc1c19dfdfda2cea62c2748712019beb00a27b9a2ce7d3612c96. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6M2505356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fdd680a231b2babfa9781e1f26cf49254743768cf301c3b5e1093db7e583b1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USUYG1732562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd81eb5707bd05d32dc8e601bc905ddd3f668d6fbb6d1c9802feeba168a4ba59. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USDM32244402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0208cc5a089c6da56218502bec20c531a86ab1f8411434e76a01ce451c376047. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:11:27Z), 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/QZHCR2100168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb191266a733e1be62e66a52b99dc3a5d467e545904fa92afb5755514750ada0b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMHL2572908.