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 0x000ffdf0a3fbb66dec2f49a137307c140ff58f0c27a895b760f06ddbf9fb8596. 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/32754db3-d033-48d9-b840-a80ea058a2d1.json and https://artists.proofprofile.net/proofs/artist/32754db3-d033-48d9-b840-a80ea058a2d1.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 0xd9cf06f7273c3e63daed688472463302b675fd3f80a5f56d80d495d68fbbd767. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GB7NR2146218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e839980e2c658cba9475cde508ce517c0588d2db42445baaeadfe4a7368fbea. 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/GBK6Y1672005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbca15f3256c93a77cc53e97c53d3deee75099c434da0f72dc2b42cc2bfe577. 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/GBKQU2465339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf8542994bc118c85950c5d9dea7dfc2dbff11eba5b5614c1febc3330210e57. 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/GBJAJ2400757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f6317cae8d29dd8e88c608f4d52335d82deb8a3131801bd8b78ca03ee8784a. 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/GB7NR2431101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6a9661fa0a8d7d198328121b77b098fa4b8d9da9785724a021f5643f75ef33. 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/GBK5G1000459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f7dca16e4e7aec98911184e74a449cb0d8c8b766c404321050089afd44e0ea. 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/DEW872401684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd890470da926ce0f65cc16622d32726b9fd65f604eca5376d7080bffe3b09f. 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/UK74K1400766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9124b12cee046c247f6223ff86887f91d8ff06e54fea3bb432b675f79fb6922e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/US38Y2312966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a63dbcc6d45941889c270e0326577f23431af7877af89ca26d12ced3709ea6. 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/GB7NR2329704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f3afef9c006b72c467c7dbf5ef37b800c30b00e590d887d0a8f2f7324aafa5. 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/GBKQU2351383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d90e47ef05c35da1ba179d64b0486d3aeefd7db2c8ab75a4bc933de070fdf53. 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/DEW872301509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c04903e94ec18c58cc2dd492b16858125aa6084bd5d9b95a70991336fc0793b. 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/DEW872301510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22833d603bb3c42aa2d50ac61988a6bf1dc3e0bafa375eed6f9e86fab90d7d5. 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/UK74K1400687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae8eb14ebd607e8698fd411e3bc3756c0139c7782b38eeefb7cd021086f57d3. 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/GBKQU2261486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3b42a75581174b62d39eab81d9427bbe2e69dcd8a072983a6908d94fdc6b7d. 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/DEW872204468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86de3f93c0fc3a82e3f6bdabdbdedb7f74682108032ef8872481d8168d6e075. 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/DEW872204466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3f4f3fa909310cf4b312ca8d3b9ca22a65079cc969d61fc0bbfe58df5d7328. 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/GB7NR1718103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065471bc1b0074039d27eb0c45b6451cebde31fbd8a190f05dbc375a2ddccf97. 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/GBT9R1200027.