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 0xc5e052a02271a8a6fc409b6f707478817cf8e515620eda80722c7a73bb130330. 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/d2e44fdb-97ec-49de-9203-aa0b25ccd58e.json and https://artists.proofprofile.net/proofs/artist/d2e44fdb-97ec-49de-9203-aa0b25ccd58e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sebastião Tapajos & Pedro Dos Santos, Vol.2 (Edición 50 Aniversario)
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 0x2017bee5ea3a9e8ed990ecd4c4f4bb6157d6a62c2a186ff9b5fe28aa93e8a923. 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/ARA947200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2729777669709b35507c6585efb3ead87823920b3f1aa3f5b018356f7cdbae. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:01:19Z), 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/ARA947200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c07ee3c1580207fda659d8116fc58b4d449dc736f5a11b1277d3584ee5649c. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/ARA947200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d6e66450db2259dfa31cdb5a63d2ba500b5675912a085296a103c9f1cfed12. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARA947200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a95d6513290aa9f4e4b50da1a76009c7266bf85d74dd9dad10487e874c99cb6. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/ARA947200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cc51d6ea7c357b00e39348996789f1c09cd051a0eb356f31b06e218f45ca30. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ARA947200025.
Sebastião Tapajos & Pedro Dos Santos (Edición 50 Aniversario)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b446208b132f56b55b46fab834a1a7bf6dc392060e31835eaec971b2539e31. 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/ARA947200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6292a0f2c2eb10cc823c8f29654bb58252863a5a1f5862d22b3a0e84b9139a21. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:41:57Z), 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/ARA947200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873780e53aa3463ed9d2cf90e3db5b3548f1c184560c80ab9eb83c85ce672e65. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/ARA947200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b29d6275a9409ccf0add73e8f6e9bf4ab6ca40cc9ee74d7df029973d31c717d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T11:10:52Z), 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/ARA947200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97d00f8f59ab9201cf01665c2864724a52aa1a2575d329924daee06e93f10ee. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:40:38Z), 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/ARA940600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946e0557d80a4cf1e45774bad5454e028037abde8d40c3e049853a92a6f2f5b3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/ARA940600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254cf9b89ae36315577eb50e53666c2f09b97863589dabf477ee591e1fb390e7. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/ARA940600032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b446208b132f56b55b46fab834a1a7bf6dc392060e31835eaec971b2539e31. 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/ARA947200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6499402921737f97398d861ce0aadadae8991810000e3f1ee56af99ae82f22b4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ARA947200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873780e53aa3463ed9d2cf90e3db5b3548f1c184560c80ab9eb83c85ce672e65. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/ARA947200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b29d6275a9409ccf0add73e8f6e9bf4ab6ca40cc9ee74d7df029973d31c717d. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/ARA947200010.
Sebastião Tapajos & Pedro Dos Santos, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe429136cd35841cef1eb498609763494cb426f8600ac0a8ceced3ea0576a93b. 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/ARA947200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a95d6513290aa9f4e4b50da1a76009c7266bf85d74dd9dad10487e874c99cb6. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ARA947200024.
Sebastião Tapajos, María Nazareth, & Arnaldo Henriques
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1112d527e4065ae5ff4410916c2e27da26dbb71811a55f6bec23ed91c0c75c1. 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/ARA940600044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db22295871ca6df23ce40378159b7714e87461e89f2b8365bd33e909887224c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BRA221304241.
Apresentando Sebastiao Tapajós E Seu Conjunto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2de981674e80e67d0317596b71ad197f5a2402f3755eca1dfb01356d23f5e2. 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/FR6V81768699.