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 0xd33204b7121a910da391ef43da5ae02a6370c042cdd375006afd60cc5e2e419b. 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/34958676-f9c6-4ae0-822a-ec93bebf7971.json and https://artists.proofprofile.net/proofs/artist/34958676-f9c6-4ae0-822a-ec93bebf7971.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 0x848a0b99554b83e4a289d3353cda1953e306cb6ae8f086a09124773bbe1e296e. 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/BRACT1607336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71adf265b977065a802c6b0e4f34ef8d795d2e887dac16f42fcf676910cc6282. 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/BRACT1607234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978c6040a8366f503d85168f0e2cff20abca2f70ca5e84d7dd006062d6e78df7. 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/BRACT1607239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd56872ad9448dd4c0c18f095fac35a8aff99c346f9f0ec38d91c262d4912dd9. 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/BRACT1606175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a77a26a575f0feb85e518a542a7d8a5b67801e257867de62d94f295c0da0697. 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/BRACT0400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46b379fd66bfaa9a3c273d5d5c5a1931446a2aa9c3de6323a78580e56e5e38c. 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/BRACT0400187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9620ba73e943da27f7d153a1209255e925d18ce65238b79d95ae3d4174af0476. 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/BRACT0400189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9db365d4f2076f75279e79a4b0975847f9b40e3d1d3e0dd9ef81cc0fd5432d. 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/BRACT0400193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0587f1cb6acf7e51b351e7e852e32c9b724db321aa45b9d1c59cb2eac69b48ae. 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/BRACT0600581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91aeda05aa6e32004af2412625ff578d7814a1d1679282ffe104f7a9248f3d5b. 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/BRACT0600582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d6f146486f73c9a02c5f400429653cc02e791ab82fcd297a601b12cff2b2ea. 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/BRACT0600586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c50202a3dfe21441eb028af972b42354c618eb33dc0a4474811b8a22b3271a. 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/BRACT1605818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42683dec5c732b1b493b0021fd971ef0454adacf9d0ae6671ae12df4a92c3b3. 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/BRACT0301080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0b9065c0247a3c3c1f6bc48dc9f493f8c06fcd0f91790b7c9ea3e44994092f. 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/BRACT0701204.