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 0x893072c4ca0cc235e89c91a6af390bedc95cd1fd16681ce2abc67c5f03c85b22. 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/66f5e319-e60a-4770-9b3f-1fadd1cd8246.json and https://artists.proofprofile.net/proofs/artist/66f5e319-e60a-4770-9b3f-1fadd1cd8246.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 0xb1faaf96eea9b89b2ab20a363b3f034ead9a3ffe9a22889f2261c90d5f819a50. 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/QM9A92081263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdced9798f7233fee78ee118058aaa84ee2788ff54305105442af0c2399fc45f. 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/USHM81637494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcabfc4479cff20264c10fcc808ee466ad2ab95eb114a2fd069de58fbe394d2a. 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/USHM81637495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d20defe01062a2066b29f575a5561c5dd8df61c88c97045a674cbaad679913e. 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/USHM81637497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9967f205ef495ba4f2ce8071fe043ff53ac65f52a54bdbc418fd18a12cade8. 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/USHM81637500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf085ec9a5f49b22d4bd62f7e9d47d57649eaf3684d2201d10ef9ee1b561c16. 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/USHM81637502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2edd89da63e8f8fc3862abec77f69463ce84d8e51ad4397557c55df49dc8d7. 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/USCGJ1327475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd352a3f4cd9b7a211db734a32bd9e152a6e776f126cedef4733500b2474f8f32. 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/USCGJ1327477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d34927368d6d6400bb8a54701468f426ff80c568170260e1abb695726118b1. 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/USCGJ1327478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5592cec31e5285abd1ffdf42a8f6f67f09623b1240a396211ea26bc3682ecb. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:31:42Z), 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/USCGJ1327481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f80a6dcb1bc41e7b0049a9024ee018dfe373025c7c11b463b51f543a466715. 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/USCGJ1327482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ac788c1d512677d3473651c72c21dd8f71a767f4ca3bc07823320483b4577d. 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/USHM81051296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77274c78539460ed02725ef2c50a44c8b67e4e835fc265c91ae5f2c0c42c030. 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/USHM81051298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b52fe05d0be8b621b067f245f12f7260d9d109dcd9a0c0dd518d80ad27385b. 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/USHM81051299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc670f4a7db305d9dd73edbeda6134ad71a23872543a7336ce0c60023b35b0ca. 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/USHM81051300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b096780d865b826bc6f6751cce2755e25ad0f272eb19ba25ed2b164e971427a. 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/USHM81051303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29254736f31ec161208e91696428581792a6070ff7d68252566c50d593c1b661. 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/QZ5FN2224552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1540d2586b2a9ebb4c347caebe1da77881cf9a6a8c6168a5e213fd31f43c7ccf. 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/QZDA42522567.