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 0xc1d3f9f0efcfb6b101fb260a40ffb104252f263dc43af1cb6c923a6b914c06dd. 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/5386ca5c-06a6-4d67-a7f9-0307269944ec.json and https://artists.proofprofile.net/proofs/artist/5386ca5c-06a6-4d67-a7f9-0307269944ec.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 0xd949d7f97bf3db1a1ff8917ce765e5ede228cc0da55586d4de87ae05251e8464. 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/QZK6G2250263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46e519e7d98e0323ab25eef87fec443fb4255ed7f24fb7375cdf6c27e12b95c. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZES72324506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa8f56b543f360fd718e406d3e23cc6c0fa05f0be6d66b89b7f41a2993d6307. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR9W12407503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e557e89c7d43a2387f5cfe42ca7aa0f7198a08adc53c63250055b58644c6b6. 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/FR9W12410496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a38ac8fbd07263674b5804474948a8537bb055f4b779637546710cad410181. 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/FR9W12410494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa8f56b543f360fd718e406d3e23cc6c0fa05f0be6d66b89b7f41a2993d6307. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/FR9W12407503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e525319574cc9b72759af029287c65efff58db5cb2903ae6ab795c3a3792e4c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR9W12410495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e557e89c7d43a2387f5cfe42ca7aa0f7198a08adc53c63250055b58644c6b6. 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/FR9W12410496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d82f5800b2923bdde61a03c643dcc0fb28723fb8eaf526206e8bee02c2daeae. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/FR9W12418040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d82f5800b2923bdde61a03c643dcc0fb28723fb8eaf526206e8bee02c2daeae. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR9W12418040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbff0759acc49b6b18965f94f0ce2dde2e2c08cfbfdf8d4d09756017779e0a4. 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/FR9W12461517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238595af4c6e884b159b139d5936b47bdb02dc5fe57dddad85cdf0e4b3db2851. 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/FR9W12363072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238595af4c6e884b159b139d5936b47bdb02dc5fe57dddad85cdf0e4b3db2851. 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/FR9W12363072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d37892ddee514d41d889f09466c53089a70b445a040cab8559826575cfbc46. 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/FR9W12403458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40619d37c04f757fb66900d10b94acdd2c71d01d4141538f10f53251d1c2a88. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR8FB2307210.