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 0xa99080e8f5ea41c767c477403c23d9478fab72ce35a0d445af1ef0540d56080e. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d1038be-3780-450d-9a0f-45529332960a.json and https://artists.proofprofile.net/proofs/artist/2d1038be-3780-450d-9a0f-45529332960a.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 0x7aa14ece73650b4b2e56a2b85709f63fe982d907172a5c3a246237b766fae25e. 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/TCJPQ2126244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e64bca70b2afb2cc70da375aef26b4f164fa2f9e5844bd0c497cc4ccd82e819. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCJPW2369501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e85692413343fe755343ee34cd527c33053243d2e7275d01f54881fc09b2ed8. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCJPW2369507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704e2d40e9b120a73c8264f7b702ad523726d41c494412e5aa7c51157e268f65. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCJPZ2462738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e2907a5e5a7fbdcbc1a77d86e34041a4c6269d48eaf5f616718b1a187aba53. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/TCJPZ2462745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cdd5354ecfd93a49e5f5d15def03994c0f7a4189c08d165c9cca85764668b7. 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/TCJPB2417553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc023cffd2afb8b3aa212f9affbe754b323e287403025f30a92d02ba97f7fe53. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPD2552272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4d51ae411c5189b8b6d4ca02db64433f75bfa2825abf1ed544a391a22786bc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCJPE2510981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc00a2c44ec225a2290ce484f2e445b85129cea929ae970eac0f313a6e1c7e4. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/TCJPE2599836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc00a2c44ec225a2290ce484f2e445b85129cea929ae970eac0f313a6e1c7e4. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCJPE2599836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e6dd00f8ffc04c599fb63cc02b3f70aa66c1e7bd4bdef5f0a806fb249cfde3. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCJPH2561057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e6dd00f8ffc04c599fb63cc02b3f70aa66c1e7bd4bdef5f0a806fb249cfde3. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/TCJPH2561057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0fc3060450f0d21d704837f9c027634f83e5c72d5efe06f3fd444591ca7966. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCJPJ2503748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bb1216e06ed615967643bedb05be8cae76f7a44bf2523f0209b8e3043b5f59. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCJPJ2578457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bb1216e06ed615967643bedb05be8cae76f7a44bf2523f0209b8e3043b5f59. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCJPJ2578457.