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 0x33a78512efa5ecf0210e102397cb867578a18c056929b542a0d2ddb7576c07ca. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3f02c13-73ce-477f-89dd-6c88b42f571c.json and https://artists.proofprofile.net/proofs/artist/d3f02c13-73ce-477f-89dd-6c88b42f571c.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 0x5d6936b0bfaf5c6977ed6748b02f89fedc9e212de5deb0793721201b022cf5b1. 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/QMKSC1901270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6e9c0d576fe2362bfebe7df54acb683bdccb09823fc38931dcfef7c5772260. 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/USLD91738213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe21b994fe8a25835cb0268a5da0d80aabdd1eb295ad3f50a143379b5e2e9e59. 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/USLD91737731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6431f32be4a1673ceeb36be03e2c7d2c29918bb1ce1be42420049d65bdf7227d. 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/USLD91738214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11394e8e4720b2a318285e6cd35d4ee5d5c8524276e8dec9286c0a03f2fd3b67. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USLD91736464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2c1f8f1a55d1ac8012833318577432685773d2236106270e1a719cfd1915aa. 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/USLD91738215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9018d1f8ac79fd5d24940e3c711c2f6ebf8cbfb0dcea02459eae70add2fc85cc. 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/USLD91738216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98828177fac670a22df9687f963328f2ae74fc233f934d262dced5b28ea4494. 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/USLD91737002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93e511771e665c6705c5b9678d5da958f5c4f1474ae65828b985cc3c2179239. 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/USLD91735247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ee906cbc45c650e104946e6e8b56a3ae2a8e7c9d9a5e6ec9325f7ea5323165. 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/USLD91733709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb2259137a76da71ca8dcd3dd11bde3ef6f92612fefceb4162f508d930cad8d. 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/USLD91732453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e396b15ab5775d5d65b07c97efe730e830532152fb92a5ad9978e0e1c548d6. 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/USLD91732454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b83bf3e4b86f05602c1ff6ff7de465dcfd7618675aab2e516d68da04bdbaaf8. 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/USLD91729301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b04b353890c90f17557af1e5a0f42caf065bc4289025d51290e3e87591a7f2c. 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/USLD91732455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37477f325fd14ebe95cc3c2ced06c1c11b50a2bcd27df1c2d7f53e6171add41. 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/USLD91732456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11b53cbb782a8e565e567122c5cd7ce3f148f0549d282f4f6c44170a0fa1626. 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/USLD91732457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6936b0bfaf5c6977ed6748b02f89fedc9e212de5deb0793721201b022cf5b1. 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/QMKSC1901270.