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 0xcdcca846690cae3ad7fe998172be7a52db6e94000cf01a1188bf6b1067ffe0c3. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a3d0d92-5623-47e0-93f0-d92bd160b34c.json and https://artists.proofprofile.net/proofs/artist/8a3d0d92-5623-47e0-93f0-d92bd160b34c.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 0xfea68170ab96deaf66888aa096611d95a6a5c8f362221006717889581a8b2d71. 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/DES372100560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1bb34a9dcf2a60557ccd7880b43e8dd54da07394093594940f48290bfea1fb. 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/DES372100558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717917535dc73d03dd92d1ae046f3e8479eb7d4aaad37549d04b8a471724d0a8. 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/DES372100552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a88f0c7bd603e122d3afd6295972b83078dab530d1c7106a32e992e918346aa. 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/DES372100562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea68170ab96deaf66888aa096611d95a6a5c8f362221006717889581a8b2d71. 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/DES372100560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d92381baffe91511ab1da1db0d5d8bddc5ceb56a244bf64e83ca8e31efd01e. 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/DES372100557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba5d7376a76fc85c55c31ab226817de045f990c83a8fbc96c747d2ad22bca2f. 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/DES372100555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1bb34a9dcf2a60557ccd7880b43e8dd54da07394093594940f48290bfea1fb. 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/DES372100558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218b549789c806e397e31d46c9d95dff004b0ebf1cc4195c5d4c28aa86527883. 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/DES372100666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e131e5e09043760254e15f397e8a5520fb114407a0cb8d5a2aa8fdd2e9f60e7. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DES372100665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa6cbdbe905f17d0461bffc5309ccd6548551a5c5f5cdc48a7ce398821fd2d5. 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/DES372100561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87529f88ca8e523de3fc23eb8b756f5e57b35980d60b8401e952b482bf7b2f60. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DES372100553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eef35097eff82dbf64d1b8c8165d2bb3265873da9035c64c40d78978c460115. 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/DES372100559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05370034e18f348eb4959380d088fb993dafc4268dbabb6af3d454b58e5419d8. 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/DES372100556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c495000ddea97f4d01443dfa8a46ac2ace6b5ee002fddac710b19842708fa59. 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/DES372100554.