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 0x4c85abf0ea4897a31a68ff86d45bb87f67d45acdfa1e635274d80e5d536931ae. 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/aa71ee43-88da-4f13-99d4-64f1d6f1c3d7.json and https://artists.proofprofile.net/proofs/artist/aa71ee43-88da-4f13-99d4-64f1d6f1c3d7.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 0x7499cdf123b7c526822972c838821489631963d32b98434f2c59805830ce2d36. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZANL1741623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73bafa6f3bc003273521e07f75166c9024f9dc5473dfbe371170a118ce7a52b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZANL1741624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bded05093498929344f14d4b7ff19d0143a15914efe4f720a6926cf627f0437. 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/UKZGC2307820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520015e7794ae7dc60c4c0df41cdd94ae7c42b1541fb95592966ce5d84dc89a8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKZGC2305532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c1c557eea4850b24024323326ae3c7b1c803b0546df50b762baebb7f011db7. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/UKZGC2304207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d4d5b003db3a054f8f8cdb8c65f47e0456cd1a006d042fae09b35e25b26148. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZFZ42312893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a39dfd476e660315ce841aad9d8cb883aa8787be334d3115b92306326d856b. 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/UKZGC2200807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b9bdacd3cb44c1dc80baaa057834c058accb39297c7154fcf5ddda15be0ffb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEP2279713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c9f3db567ea1fd867765dde07e6876c5ef364e9cfc812ef1fbbf7ed4b1d312. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZS652224969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9451bf1a1e7c9b85b8e16fb1ced10be349d3338a0fe47a75bb1c4ec91bbeca. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEP2224351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed3a68b1e3bcb375eb4bf4c836eb8c841a24ea37eabf8316b88f25e667abf82. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMHN2289879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c82f1f61ecc45481be4c80fb3ce7aea280919d504df85a5f33230c9b06dc06f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ22216569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4628ae9315373450f06fe103e6287f7d18a632a120e538800ae99fb008a9d108. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFZ22201079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63cd5c07c540d42609bac41ffabb0a95ef9ac143eead671f9b171be4b58c579. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZFYZ2267673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eef900759f5af30b862b7c8a8136eb0fa3ba693df2be2c86c25bd3b1e3d21c6. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZFYZ2267672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697e904ba7fcfe99dc84308a133695fd704fd38b93b54c19b7c5597797e9bc08. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZNWS2072567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d98c3ffa0ea8860941b23024051ad03f7d0f8507b5862e917cdb0a332fc938. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZNWS2072566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2c6ba5289448d0cf733e2d9f3b7f80c3c27a536f69c9a39b43460d33e79c3d. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZNWS2072227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e507e90aa3969cf04d973372112eaf7f4ee1fed826f0d5192840fe468d38fd7. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEQ022003200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f28a80cbf39cc7666b68886869f1195591cc4061cff6ec4eedb6e1efe13003. 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/USCGJ1903435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efa970e3a9b099dc0ee1e9e4b40fb560266ff0e519f9754ff0e4973782c0d98. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZES91859972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bded05093498929344f14d4b7ff19d0143a15914efe4f720a6926cf627f0437. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UKZGC2307820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520015e7794ae7dc60c4c0df41cdd94ae7c42b1541fb95592966ce5d84dc89a8. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/UKZGC2305532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a39dfd476e660315ce841aad9d8cb883aa8787be334d3115b92306326d856b. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/UKZGC2200807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0f9c698f172bdba4280c3c8b9f3b89e89b241c30dad620d09f339ceacc906b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHM81786645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9501390a4835cc939498b65a3390b6710f18473ebbb8e29b857a04d38637ec2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHM81723669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c1c557eea4850b24024323326ae3c7b1c803b0546df50b762baebb7f011db7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKZGC2304207.