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 0x3270daec07356acbc354ce8d26bc65d35ac27e739b7fdafc3bf664bdd9f17529. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bb72122-b086-4a6b-8fb6-b2058e869831.json and https://artists.proofprofile.net/proofs/artist/1bb72122-b086-4a6b-8fb6-b2058e869831.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 0xbaa52ecc27e77283dd341b46fb42f0bba65f08d7cd42b1f5346687cb79e97de2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXZZ32200005.
Joaquim Callado: O Pai Dos Chorões, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e574999ac6f8815f2e6858c85106d0c1aa06c214709e88236a1e67435555105. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BRRPL0200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93754e10f9400e706926a767499a8c9a3ca966eee89514426c3c2791dd37a0fc. 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/BRRPL2000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0f46dd5b9c3a80d93f7f192f9f5eb46bcc08b7a1ed94c9274eb12280ba4662. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRRPL2000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71e471243a204d9a8972ec8fbc97c5b480312a5960b89276b490d36d5895c19. 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/BRCDH2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7468c71a4000e423a676ed518f936534c204fe272b8ef57ac07df22d9e41765a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BRCDH2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805aa42dc2633cdace7b652c095b49e1a40114fbe0edabbbbc1129116ce9a013. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/BRCDH2000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d6ebdd6dba28820ccfc81e7b2ebc38a199b9c5d5285ed5661c967db3e96e01. 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/BRCDH2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4441d7ae62722b98d5ba891dc1b0ed792e09a6b7d24e42cd24e740d0efdcbbf1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BRCDH2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72433d694d97bd7707c51281a6a8ef546bc0d351fa6587a1b474fcff18094ac. 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/BRCDH2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580d2960d6a155c6bc9a4293b9a9582445195411c0fc1c9fad841e45c7804fd0. 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/BRCDH2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a873287175b022a0e96fcc778371c6f3ea0a13986bd3e570ed5f89f092474d. 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/BRKLB0400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583519b7f7ad5158ca2e147a43a449c62628936a8f4bb4b2256bb7ffb1232dd6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BRCDH0600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8be13b61ddabc4f0a7b80c97895a6a9cd324e327746df3aa5f09da94a7cb45. 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/BRCDH0600013.