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 0x248ece32ee2beac692ad207800e8f633112bccbd3ec6ba3f957cbedcdf9b3925. 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/d7c7679c-65c6-41ba-b1ee-5d91987502c7.json and https://artists.proofprofile.net/proofs/artist/d7c7679c-65c6-41ba-b1ee-5d91987502c7.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 0x3cc8042a6c1a9feb311c59c443d32b66fa90614142e5efed751a4d1d6a8c8db8. 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/US3DF2403863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bdb76ab0fc21eb581a7b4130931a70df047951fe5265defbdebcbe0ba9605b5. 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/UKZGC2303289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc8042a6c1a9feb311c59c443d32b66fa90614142e5efed751a4d1d6a8c8db8. 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/US3DF2403863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3869ee51bb05f60420ec487f6b5a41ea7bad74128b6e95254a3497ab4df5e2c8. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FRX872131643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898b1d5f8775b4aaebcb8f5506ce3d8a7624d9f7a7c7c3b45a1a8ae976f20098. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM3DF2127431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20f052c4ae5a7eb69b86634a4ceef427786b02eabb33e70198f4399e8d0e785. 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/GBLV62136425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c06a634f9cebe3ec25424076d6272343b4731e6b9b2ae098b40df98de3805a. 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/GBKQU2180649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd945b4a55924ccaf92739e5dcb1324e80ec38b1b8ca672db0d354a202b1e4c50. 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/QM3DF2134446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e609ed6cb42746590de6d2111108cf8c005f63664b0a9ef8bf5ced75de9f6c. 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/QM3DF2257679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeafc55534ec1d75d80f084902fbf1e68199cb041348a51b4bd24d6969cc19c3. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QM3DF2206486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ea0771a799f51d6603ae6f1ea9028e552e1cf10fe4d58ef0f31cd0ec9b4ab5. 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/US3DF2148868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a0762e38955f765502f5a5b00813efecbab7afccf583e6c4b7037ee67d1fae. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US3DF2482551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc237ab8a553f4db0c3738822da67fe35b4310c2ee7efec3a507e72e23f821e. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/USANG2235221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e8ca1152373ccf5738823cbe9a773d2689e273b05dc9bd1d744bbd2f843e2e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USANG2235223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a7fb336eab1df7ec1067f151fa9b012fe07a6731929bd9acadb3ddfd685321. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/GBRKQ2186629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce1b36547241f47afcc7ef302368eae64b6ec685d24dc5871801081ecdc742f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USANG2413221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273eef3618603c1ab6b074092a987b4665535d49825d42cc87c0e6a18a43688a. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USANG2428757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd694f53d9aeebe655ca47551dca7cb9d1534ef2faa0784b80560944498b53170. 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/GBKQU2101969.