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 0x83138e9c39d0e16246baaa5eedc33a4d8ea266cc25782a2726fd4eec1652c211. 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/0ca13969-af47-4154-bd8b-dc51311bd2c6.json and https://artists.proofprofile.net/proofs/artist/0ca13969-af47-4154-bd8b-dc51311bd2c6.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 0x39b4d730a9b2b4dd1ea1bd4a58bc1ceb5dfc0c244efcdbb2d50de274e9874784. 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/CA5KR2469086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6ac075ff5a6469ee3ef1cc3f967faff68c8d2e714113ba5c38c628fe1081b4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USLZJ2055837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37a0401d23f24b8578a46029e9e976fed81882ccef3c99554da504e9474e4ec. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USWB12305594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06753eba846ca2076b187f717d5c8c9e962b47670a3ba0ef787fa7b93ae6809e. 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/QZHCR2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe036d9535c7624c21c132c828ea983058fc555e05cc6ec39951e3bf4c29176c9. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/CA5KR2474055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2572cad8f37acd714c846f7abfa862f156eac069daab83a957483d1247ec95f. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZHCR2100140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ad543909040eb74c5005a5e0a8f8748d26ccd3b66b582d4e606028581e980e. 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/QZHCR2300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39979b8a6f277fcf82a068d1a3ab20056f90fbee5e4f70060369b3b478f582a9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL8RL2405482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e9df12a8ff811e5eafb4a1a2c51d61ab874d6508cea5a9bde693b2bc54bc50. 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/QZ5FN2389116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b4d730a9b2b4dd1ea1bd4a58bc1ceb5dfc0c244efcdbb2d50de274e9874784. 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/CA5KR2469086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf77b405f000889ab253e069ebc933117ffe424c0fa39489de172a319f1962cc. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZS672228213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc804fce55d4f2a61d3542034eb346fd744dbfb978229a3f6bfcb1d7a83996844. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CA5KR2411903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c351317c2bad710bb330eb0880ca8490c8aff698eeca80db47f6b90911b315e. 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/CA5KR2404276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047a24ccbbad33a6307e7f27271b34c826836ec16157c9ea592edaf85f482f9e. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CA5KR2412609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047a24ccbbad33a6307e7f27271b34c826836ec16157c9ea592edaf85f482f9e. 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/CA5KR2412609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe036d9535c7624c21c132c828ea983058fc555e05cc6ec39951e3bf4c29176c9. 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/CA5KR2474055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75acda53e79021641c97fba182d51fab34be6762f3a15db70f7e93e31ededbcd. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CA5KR2201104.