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 0xf3699b4b66f078354719e4224b9bc1ed36d102fec1e7b91bc6e48a609322ec0c. 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/21e3641d-48a4-4f13-a8f2-d30e1d42b08f.json and https://artists.proofprofile.net/proofs/artist/21e3641d-48a4-4f13-a8f2-d30e1d42b08f.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 0x4160c594e9a6f3690a4769d584c7ba13973a0bf374cf9bf5247889ea640e5aa2. 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/QZNJW2378074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216c9180ab82f9e454dd23314a915576e02b062bef26874ccbe8a309530108f2. 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/ARSPO2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b5f87d3a23d976287c9b97fe416810c27ad3cf507bbd114992dd210ae1f22b. 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/ARSPO2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63524f2a2d76407f811cd012e17691e902ba8542be2be3275b2618d8541eb36. 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/QZMZ92452320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3f4c7f6a9016cf5ec824cda754c9b923325cb4bf8eebdb19364a4923661c82. 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/ARSPO2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccd3505c6533f6d32dc731c67cb9ae7b0e54c135e631edca5a46c8ae1313236. 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/ARSPO2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a0b9a0edbf3b5c678aa7c32d1c7c07e34b62f89f90cc876fcacf6e5ce0370c. 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/ARSPO2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16302e52356b73a1d306df89d9e7fbe85f802f46d10b774d0e8cfb77d607c5a. 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/QZW9K2377307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274f33279b203d07a7c59735ae9a053695a6c72e475f303cab662a111834c529. 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/QZTPX2334798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25175a206432bf1d94b527222950b6fd757ecbd47fa10ab5319d0a300eded99. 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/QZNJY2347968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47958c294ec3496f8b3b2e1d37090e44d698b2398bcab8a550636869b534f7ca. 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/QZNJX2333594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81137ccdcd8855e6cabd0a94f509eff832240a1f149e0d1aa448113f20df3a95. 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/US7VG2348337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f4f316e1672bf90f108ff4ee62a13237bc18244dad48bdd16244c28ba88bf5. 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/QZW9N2260789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e060e11a0e834263598233190431fb57d917f7f246ae43494e9ade824d3fcc. 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/QZNJX2272156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040a63f037c6288eb92bbde053d58912e5dda2a478988c3c2ff546eb9fecc5cb. 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/ARSPO2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a33e8e999db49f17228d7737aa4d41e4713728398927827b45719051f622a8. 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/ARSPO2400008.