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 0x1dc4d2e513e438eedb0c3b3fe4c63b902e6bcb2c2ef2ea6aede8bbe6aae006c1. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6adc455c-860a-4ea6-8571-fc7dc5a36fce.json and https://artists.proofprofile.net/proofs/artist/6adc455c-860a-4ea6-8571-fc7dc5a36fce.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 0x549fbab449678f70b68e95666b5e582c2fa08df7151c027d3d193fdf21655216. 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/QZNWT2458787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a26c537bd0d03d3ce5f227f1a4e657774bd701c6717a7217061e5aad7605a8. 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/QZTB62345130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84920b7919f778df2882879be6911845c90aeefbbc4440d0d438682b894d2ad9. 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/QZTB62345131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f75e8d7d09985bc220a3413510847cf7d4be9cac7be8e8eb880aad18745e81. 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/QZTB62345132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906433fb1656ae36071a72b235e882368b3dff667be03f8816ca1ba3b45adbc1. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZTB62345133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe239be3e2c924d5313fefa5c7f46d7bfd3ccbc151a02972840558e6e74bdcac6. 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/QZK6N2331424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa364870b9278bd143c72c306ba73c9e796e7ab911adb0581dd36ac23cbfad6d1. 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/QZHN52387257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9abbefe6e76e43ad3022a84a42bf4071c973e5e883eef8478856741287955e. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:01:27Z), 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/QZES52399657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4f0a1d5c2c0e2f5cbea19a4dc9377caf446a4a47f6a8ce7522ef8ede3212cf. 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/QZDA52332411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff917c9411a01c9a0af63bbe5efd9d560fe4ad11259db644826865fb95623c2d. 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/QZNWR2245518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc500c1bd1ce585941e76ac2a44c968146a3175584e819d32e4a2de5b21c0a21. 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/QZHNB2279829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a678e1e5109f02c9ebaf4dd9f80a6c7e62ea859f362b372307049e444b47a5. 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/QZFZ22245332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217ddad546a0c2fdfd444f8b4c221ea898f4edf96f8def94fc960733c0833592. 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/QZFZ22245333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4c2ef103e94c598238101b3863adb4e07a80f79d68ffd032f8a548bc5bf8bb. 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/QZFZ22245334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20586962821dc8d528f444757540c50052478f131fe807a787d5a345656c7bc. 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/QZFZ22245335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0066b6333ffbf854f4038348a33251d5990fc1896f1435a6f75747d18d2b12. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:27:07Z), 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/QZFZ22245336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec74471a66e5e8776044ec366321a45f20259f2e017d7d17116f71bf03413568. 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/QZK6H2103421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b02b8576a9034b6abf16d553b57e2d48496f3d8d1ffb877190132bbe4da7c8. 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/QZHN72182125.