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 0x983f0e193e811a94eb57c783eb7fee467a48b8c316b4cb35ba175ec2a5014f2f. 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/5de2f9f7-3d7d-46e3-813f-7c8cf7095b64.json and https://artists.proofprofile.net/proofs/artist/5de2f9f7-3d7d-46e3-813f-7c8cf7095b64.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 0xa28e00902145b1b2f07f1c5db2040bafc3114765e31aa0748ad5a6630ab6e830. 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/USA2P2438397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f31eba7aea18613e6a357bb0fb0a198c90f2fd0140264670ae750f5056f5c63. 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/SGB502220462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dbbee0ac0e9bfbc3bf470060014b2d87e0456476b3059700aa663773f08235. 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/SGB502206408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a9b2f6d3e47dbe5b6c4d371f85be89577bae44f248a3acbf2032a5dd4c46cf. 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/GBKPL2158392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5ee33ae891917fbd8a7ca7357259c3205e425b8ce6fab6069151ddb5228e92. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/SGB502220463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfde4d397f239ac75c6ff92686bbdc082cc7bce9f41c65ff362b4497b1df65ca. 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/SGB502220396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfde4d397f239ac75c6ff92686bbdc082cc7bce9f41c65ff362b4497b1df65ca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SGB502220396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dbbee0ac0e9bfbc3bf470060014b2d87e0456476b3059700aa663773f08235. 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/SGB502206408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a9b2f6d3e47dbe5b6c4d371f85be89577bae44f248a3acbf2032a5dd4c46cf. 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/GBKPL2158392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c010920ffe7e134eae8b55c094ee90f165eb1e61e2425d37f83b85eaec4c862. 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/GBKPL2026295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8338996f0e44b4f444f5d59cf02033c24e83c6b7a93ee9d1b85b71aa504041ba. 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/GBKPL1972263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1d14a0a99beb2c8d3db1caee1e97545768e53180a51b929a92cf8343158ecc. 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/GBKPL2026293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f22cd89c6a5f9d801e4f64ba9afa93a24ef7235f06658789949b2478b5eae2f. 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/GBKPL2000786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c097ab96b412e25c3fee6f6a935c398c67aeac90097fee45688490ed3ca3cba. 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/GBKPL1980152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d8946803433727b1812374d0632f4802f55c6177cf32bfcb9ecd6e4a49f435. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/GBKPL2026294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43f28f3134481ad3357293df8592c517b0803a813e4cfe8a286b2a8ab188575. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/UKW3Z2000352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4eb9598165a5f7edfaeafac7da521b1f12197c269f02c01717ac4cfe06d45f. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/UKW3Z2000391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202126b6b1b11102147d791bed0912192a1e8364d993e4766cca9e0b6c76ace8. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/UKW3Z2000399.