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 0x2309f19e01615c75fb6d5e9fcfad72e130d1f2d89356d877854a608dbbbc60c0. 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/1e652bae-3eeb-49fb-9d26-b0a078567118.json and https://artists.proofprofile.net/proofs/artist/1e652bae-3eeb-49fb-9d26-b0a078567118.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 0x8f40497737c663e4e903efd1bbb64b722021000ca1241385aaa1c546cd7b7db9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCACP1680213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983f0c7eede7e6ed3f8ee49a223992a20c6ec7e5a2e474d2ba19d033b2a6c41d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBKPL1801106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab9b03395c0977eca897533da5b37bd85782f5eefe155c291d608e9cc4d8da7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM24S1922890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a22fc2a1c3ff0d746c0b9b3860fc232c4ee0c1426b95f728d879455caba2cb. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QM24S1924486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf33b0c8738d2847f520c27116ca52c61972f08b81ff9ba17c0e8d0200c7c6df. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM24S1925571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd58f155ce997815b4a3b8d698ded9295229b59c88c292055eb10fdcbeef0fc5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBKPL2020783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff75dd3b85e568a1623c33085b0c8f4eb24a6ac239ab8e41087dc9179a0f801. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBKPL2031162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99d611e30d01fce0bada7988a22742c28d1bef9bd58fca2a4050ce07d993f29. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBKPL2137069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a3435b559a758cc5b219cd8faac6ff4fb9225119f16005a9a572d4203409ac. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CA5KR2306784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f0647ef293a90b976d4568b87671e5e91352044ac837f9c4678a3fe18c9524. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CA5KR2387682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb43801de256a690562c92f5fca41197e013774b7848ca8848cffd0e733b146. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/CA5KR2455707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafff7b05efb356565b955eae4ef0c9121c5620f6399f08d19c1664232394bc63. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/IL6652411323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fabe1d643f7d1f1047da9a4e4410dbe7d86795029cd048b8832ecb22f800277. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/IL6652411328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39db5b66a2d5ac8f630898eac97d432af90d627acaf489e064e97a55f7dc2961. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:31:46Z), 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/NL8RL2461093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956076135cf0ab904f16bacceeb539effd65aa24c1f6c40ae99987902177a19f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NL8RL2502048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39db5b66a2d5ac8f630898eac97d432af90d627acaf489e064e97a55f7dc2961. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/NL8RL2461093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956076135cf0ab904f16bacceeb539effd65aa24c1f6c40ae99987902177a19f. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/NL8RL2502048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7604814d181795386871d98fa5d632ba2013f9a44e58d908c5085ec1a28647. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NL8RL2517937.