thumb|right|Fernando Brant participates in the public hearing on amendments to the Law of Copyright, in STF, Brasília Fernando Rocha Brant (October 9, 1946 – June 12, 2015) was a Brazilian poet, lyric
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 0x784ee06599008d8ffbebbcdba7346e0e53824c70734f354968d2f13b888d6670. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1752e340-7f6d-4f0a-9f34-81cee5b0d946.json and https://artists.proofprofile.net/proofs/artist/1752e340-7f6d-4f0a-9f34-81cee5b0d946.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 0x7940f4d7c0021503c0840a3645f5785cae234d0f48a679d5a96613865361cfa3. 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/BRFHR0400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e45c484d92d0f0524bb56812f2da3c012a55e0746eda9443db01f3007e54fe. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:05:55Z), 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/BRFHR0400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79487d687bac8b27162fa44e05c9d86e5f44f3f075ec10daf9c3d6a04d2b07c2. 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/BRFHR0400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b37b3eb72df25dce480aa0680a14e870e71a45dfe842c6f23df14afd251fa88. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/BRFHR0400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40130618d9c4db8a8c452ac0cf4463dbd47923536535efeefe83e2ee9965906f. 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/BRRRG1900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea192c8263b2c4ca40847c76c8b5f56eaf716ebcd3236242624e726589b62ee. 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/BRO8E1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca79b687112e43ed5900205777a4fe25a86f36c43f55403f988f4be31896f6e0. 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/BRO8E1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a59d324ed06a6b70120572a1ea0b7de4975c20dbf56cd34a472244c52fb6358. 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/BRO8E1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12960ba20a24294dec989edefb3c03ce82028b5e28b8a753f25db7b80de863d4. 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/BRO8E1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a95ccd887717ad494ef047141bc684456ade96cdf5be503d1a6e3fbccc8dd2. 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/BRO8E1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107072b18f4e93bd359f0c0038244b5f0567fe155420536083a1e43fbba3a97a. 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/BRO8E1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea63a8b9f8ec04f42392584ff71999146b315fbef2a41398abcc67dd0fe35f7. 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/BRO8E1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b0fe563a93c249a901509ce98e7bf85edb73bbcf5c79d09d5fd1739cab623f. 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/BRO8E1800018.