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 0x8a1abd02c0ab64b9343247e4d7b361feed31bb9cc8c47d5acd9471bee6da7cfd. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1378618e-ea6f-4dbf-8c16-aadbda23a216.json and https://artists.proofprofile.net/proofs/artist/1378618e-ea6f-4dbf-8c16-aadbda23a216.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 0x952744c6d741012d9f202ceffe4382f816fdfe0f0b5a321a16388a0fd7899e74. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZWFL2485745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91eb333f743b608a45f98146528e804f9467d40915051623099ba705c36fdb92. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZZ762471675.
So don't expect an answer from them - instrumental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0741fd2dca3475d37e5176fa1f22df8b649b27bf5e3d69776bdf7ab2d1ce192a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZZ762471676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65a561254f0653139200b61aca6e19e8a2c7557e1f0b0f9e34905dec75b5e38. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFS2416616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4731de225891c9f2a7f3e33635fd3f1774ac07aee4a24e4fec95f856c33584. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZZ7S2404516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad63ab53d738ef25e6087343abc60c697df0086c6a852c48c73cf1041eb605a0. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZZ7P2458190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7df56e427f965d69c002de199bdeb9d6da6b7f2071951f2b34d31349975bfa. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZK6K2548649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591e4ac9fd277696632a805c5629d59118a7b81c664e80663a194f98250ceb5e. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZMHL2564909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5ae99fdfc187214d694782d22c84c4f3e72cf18244363dc1d5f8c560391044. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES62590038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7df56e427f965d69c002de199bdeb9d6da6b7f2071951f2b34d31349975bfa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6K2548649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7df56e427f965d69c002de199bdeb9d6da6b7f2071951f2b34d31349975bfa. 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/QZK6K2548649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ace9d29a10e92d75aa43aa4d27c4f8f0303cb5243dd2de436e25c21e54df9f. 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/QZTAS2520917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba4b41810b4984dc8fee0a55214e901ec26c9f03c6346ef55515be5684fabc4. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZTAS2520918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44f11d093255b38eb7309c23e0711bd63a7d96f205172d75eb6fe390da5cd11. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTB42572844.