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 0xa0da349a1f7801c36fb13a6cd81b586fa6bbb05d9679702ce17fbaee304630ac. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fea1a2fa-ca87-4ae5-9a66-f6e48188a289.json and https://artists.proofprofile.net/proofs/artist/fea1a2fa-ca87-4ae5-9a66-f6e48188a289.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 0x0fbd7f841a7d1d15518dae8ab9b4c8630976dc4e893c86f2b7c4a5148c3c1351. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/GBP6T1400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98f482cd84408a1e419f4440f3a4adcfe01f41c0e618fbe1c642b69e4b7d081. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBP6T1400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acdcc9b4cf4087a1172c516d1f628252d0621337282c0db3e485203c2e0df0e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBP6T1400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a21f2535e893a66d84e050d424f029d6cbb0f644a6eab83d5602b666e13f0cc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBP6T1400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b44119e40bc811aa81cf57acbe3ebad9d7cbcf8fb46e0e77ce99802b589d1ff. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBQEQ0600478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b4303ab7019829266bf82b5550380ceb14dbef9293adc61770125950607757. 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/GBQEQ0600481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1438324de8f41a60cc288f48d53cd9df976312a6cb07773cc1c4c12a5fa30a3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/JMA271807202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea23b2086327084e7eda4ff3c521b50d884351af55f3b7ea659b3da20c4b959. 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/JMA271807203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6b04a5a456ca4387c2eb4b0d768b726504cfb99cb4bffe3ec8e2934ee7999e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/JMA271807186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054ac0a437de4272586e1278df19a011b94959836889ffff30ec390420fad966. 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/CH6542203079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7af91d25730ecd93976733dd30711ab460fe977b20c8916188ef2946463122. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/CH6542203080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39be2c1486a95f19dea3de5a513369fd9b65d254005f24c464c786bfbf76a948. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH6542203081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bba3c73b40592042ae91b169f984619ff07bce23cfaa46483ce91b9f4fa814. 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/CH6542203082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d871405f249d5cad126b81b6e9f3a8949424de3697151798011a7c7e1bfea96. 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/CH6542203083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7436700555bd4b77658d99900fe19c0682e2741113d7686bf364cd21a1104d. 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/GBQEQ0600516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15e313fe886d014bfa0d79005b1a5a25078e0193306006a69d97aadf9c39b23. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEZ651360256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714357b964f424cf2c1cf989b825fe57de4c8059d066811376936d392a147343. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DEZ651360264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7b019afe05260efed900868860a316e9063e8442db6e4351b7ea9cdb1d7c41. 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/GBQEQ0600082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e9275443707ba55f641810aae53b1cb19593813030ba5867049f21d2f10179. 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/JMA271807190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ca7cf4f652130aadb4433f99367862d8f1765156d06bd4d56e95eebcb4b65d. 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/JMA271807192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1893e2caea5335a23f5907b72e6ad434f672161e190a4010976ad1cf907fb1a. 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/JMA271807193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151cf392779449af8e809522ac85ea28bc2561548b743edb8c8d0b8c882e8383. 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/GBQEQ0699075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11941d551acb07d1c644818953669436b853b953249f4f53844923d6f718e14. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAW2374105.