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 0xcbdca476b59b9f5105f2f3c5755b9c09f0b807ec7b25532baa1b68d5eac94427. 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/3b6678de-7993-44a6-bfc8-575a04ee6a13.json and https://artists.proofprofile.net/proofs/artist/3b6678de-7993-44a6-bfc8-575a04ee6a13.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 0xa78925db1c7aaafb1be7a83b38474a172058744fb7583ea5914d91ef7cad0692. 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/QZAKB2456466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed93c86b4541cbeac209707088a61872005bc8d37949ef39dd1dbd215e7a369e. 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/QZAKB2454766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15772ae48c324306c7a65225ea4db738edfa44c8e064c9f3c6032e4f70fb07de. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2453328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc7603649d7ae4471cd30d048223d4bbe8600f8107fbbecfbd250fbc7f2e9e2. 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/QZAKB2450871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad46a4140f6e013686d3a2027eb33aec81144e1ab84b8b2afa780c66da73c8e7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAKB2449157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff367543ae1cfb7dab0e303e096bdbed28fa0bf1d8607d643c354c5f8e223ae. 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/QZAKB2447725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac722cb85cdedbb09a59edb3b0a7dbbda1da412eeae5e86e80f264995316d331. 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/QZAKB2446404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9eae4fe340fe85481570b7254edef491cc1a3ee576e88cc45c77d7389f997a. 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/QZAKB2445001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1704cb09d1744d5bec219522b902d104c91956667889928e55b81e9cf10f943. 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/QZAKB2444068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe152b48de1059bb317297df9e2297bc334f0f73448041c32b3143ff28e57408d. 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/QZAKB2442972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa004c380ede335e6eef3d683cddf1c920ce5eea010f9a94bebef84c9978b7f3. 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/QZAKB2441213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fae1275fbdf43e1fbb12f4f04e894da5ee9119d7439d87fb59f35d564e330c3. 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/QZAKB2440295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d2aa9876b3f2008aaa84da4fb73d2fe827dbc00950064c03fe7b7caf7b7c04. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZAKB2438831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bea798977625ca11b120d2d1f897b92fff2df26c1885761ef6836e25c35ce3. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZAKB2359613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f7c05b5e02954d43d315e8afcd63ea31a0d1842336e342d12c8a86acf8f407. 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/QZAKB2358319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66858fa3b17d17066f7f108a9155a2218c55bbe4f0cb990153b43a0e80abf0b. 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/QZAKB2356852.