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 0x439701bef581027b95368d72a2e294925c7f2e5182e3b7834f4e1d49527e8b78. 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/a3af7038-ed37-4593-be16-be091047b0db.json and https://artists.proofprofile.net/proofs/artist/a3af7038-ed37-4593-be16-be091047b0db.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 0x84e9998e2006b2ecdcb849a8eea4d30c74597a226474498ac7e435984b958f9c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBKQU2470581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c71a274bba25aa25016fee99360c648d6c263e45814e6330cce249ff7ed601. 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/GBMA22437076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4785522e969dd7974a910e1df68d360dda3a9e3752a6fc271a98bc78b9af79. 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/GBKQU2442028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7a50c917abfd9f11c5da6ab731860bc5fe1b447b0064dfe2a6d99d27467108. 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/GX3Q92490769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcd539350d15ea27fd2ed8db0aeb7ce872d85cfd63c6891b416ed042fdc2824. 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/CA5KR2432695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ac43f1c70c02364e0c9a29b115c501ff844ddf7a33be2041cdeb8e546f8d9e. 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/QZFYZ2414028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6728300059e86fb7291a4b7885ffc78565454d70af007945674fe498f17b4e. 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/QZMEN2328542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca90bda3b367b1d7c539e25df092f8784212a4e57c1ab93b78290747ebf822a0. 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/QZWFE2368602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5914d67da9624e39782dbe98eb9434d4be64260f951ee987aecf2caf9c2fc07a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2380600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f82ced450f8c1de217a130ef3bee0070b071e6c618f06ee51c549767750639. 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/QZTAS2342004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009ab2e78942ceefd4cc8af566601939784933ecf876dbce36a4123f9e96e4b6. 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/CA5KR2373569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5c9cea788dea54a4028d123737982ea5eb9fa05bc872bdb709eeb8931bf43b. 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/CA5KR2340211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da040e09ce00ea8e288e34a9575935dde1da10f76385dc74ba44eafed7b6ea4. 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/CA5KR2408397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ddef0881965d2a48fe4799e2edfb69532e9c6dd7b2a7437c6373b6f96597d8. 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/UKXN22447342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888422cd5cf8fc11c000921c57bd6ba0b66a74537620b1e2a977821511d0f69d. 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/UKXN22447343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4bf64b4eb05b33f202aa5cb6f85f828e2f1e1bc6534f5f221be5da11a14a8e. 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/UKXN22447345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee30023b27f9e190a66418ceb5d8ebb85b44d7e7679025ae2f49ec7c876eee0. 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/CA5KR2407847.