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 0x0c0527990cd7b11b9f4376320bc3a11566179fda9eaf7f7b7eb3fc8160742df4. 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/d32618eb-2219-4de1-b17a-fc15673769d6.json and https://artists.proofprofile.net/proofs/artist/d32618eb-2219-4de1-b17a-fc15673769d6.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 0x8e3e7a79e64ba216b43533fec68f4eb050e33628b40bc26d1f344b64df3f0c3d. 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/ES71G2407849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816161baeab96033b963d464321c8fb4b4dac18edd846cb12c0889f9a165aa85. 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/ES71G2407856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90944c6fe1f3441eac0a14cdc019e7eb19d89c1ec0198a62ff1ae69f0e20d979. 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/FR10S1925748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d13b8e8b43f46a0307440674c003bb35edabf2aee725f1c482a8e3deec80e85. 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/FR10S1925750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bf01ddd70d2c8d47bbfa51b823d8ba0018d10e7f859a491356b70fda50af97. 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/FR10S1925755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe533e6f1e81e1a1f410094a4db17cd7f4e51d7362dfc3904e27b4b1878e4ee58. 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/FR10S1925756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848b11e9e0b4c1b61af2d0af89c10feda2aaba7b82faf4972d205817996af0af. 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/FR10S1772522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0bf06b9876565acf3cef404217dabb19be742c7b7a60cfba9a5ae53ec527bf. 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/FR10S1772525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa801ecc44e776302da09926f1005894bdc10046760885d147b705cd6002f9031. 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/FR10S1413780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad97939f6a3b3d9e4910420c7c3184b2346b4e5ee55e1f5331ec73d4133328b. 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/FR10S1413781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc4cfb83ba5d5bd0649b85e47d783b224dd055285e46d64a26ada3a0f1daa8d. 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/FR10S1413782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a7982d950e3e17364504c55c2cc7c63210e74ad58ed0cdb12c9a89965d6fa6. 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/FR10S1413784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194c20207618ef31fd01fa05bd15d796578a830c9b46701745a782e347c6bbfa. 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/FR10S1413786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c18a21d83c3243ef623a33d842f7270da0eccb28ec9ed5d0ccd4c98fe313bf. 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/FR10S1413788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5213d9e48dceaca7a6964ee9ce70a5299a41f33fdeadf4c16297669040918ef6. 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/FR10S1413790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90944c6fe1f3441eac0a14cdc019e7eb19d89c1ec0198a62ff1ae69f0e20d979. 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/FR10S1925748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d13b8e8b43f46a0307440674c003bb35edabf2aee725f1c482a8e3deec80e85. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR10S1925750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bf01ddd70d2c8d47bbfa51b823d8ba0018d10e7f859a491356b70fda50af97. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR10S1925755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe533e6f1e81e1a1f410094a4db17cd7f4e51d7362dfc3904e27b4b1878e4ee58. 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/FR10S1925756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0bf06b9876565acf3cef404217dabb19be742c7b7a60cfba9a5ae53ec527bf. 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/FR10S1772525.