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 0x5ebd96c1584389e585616d72d2c9c71dbb66ad12e67ecf07c71621ba5f4f6feb. 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/cd9c97dc-c285-4f25-9787-a90f1c09ed7e.json and https://artists.proofprofile.net/proofs/artist/cd9c97dc-c285-4f25-9787-a90f1c09ed7e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Joven Guardia Cronología - El Extraño del Pelo Largo (1969)
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 0x3618c1ea5f57de23b951572010f7cc78cb7304f5e81f101aae1e2cb0a1658bb3. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ARF036900326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152caa558dcb66cb477e24314500915d60d138777dda118432583eaf026ac0b2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ARF036800055.
La Joven Guardia Cronología - La Joven Guardia (1969)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2e30f9711a6033e8e351e960dbccce235eebeb6a61dfcb18d9bce5db2cc52e. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/ARF036900095.
La Joven Guardia Cronología - La Reina de la Canción (1971)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e115be25c5f127961ab5aa4bb9fbfbdf261448013c39187da506b74919a307. 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/ARF037100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd90d25507995df501196387314441871be06e4e63d74cf302efdbf596136fc7. 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/ARF036800053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb38029bec0e7df2c2775076b1e291f73b4047156dd4aad39380c66d12daaa6. 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/ARF037100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd90d25507995df501196387314441871be06e4e63d74cf302efdbf596136fc7. 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/ARF036800053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd90d25507995df501196387314441871be06e4e63d74cf302efdbf596136fc7. 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/ARF036800053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2e30f9711a6033e8e351e960dbccce235eebeb6a61dfcb18d9bce5db2cc52e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ARF036900095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb38029bec0e7df2c2775076b1e291f73b4047156dd4aad39380c66d12daaa6. 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/ARF037100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb38029bec0e7df2c2775076b1e291f73b4047156dd4aad39380c66d12daaa6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ARF037100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb38029bec0e7df2c2775076b1e291f73b4047156dd4aad39380c66d12daaa6. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/ARF037100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e115be25c5f127961ab5aa4bb9fbfbdf261448013c39187da506b74919a307. 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/ARF037100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2e30f9711a6033e8e351e960dbccce235eebeb6a61dfcb18d9bce5db2cc52e. 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/ARF036900095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd90d25507995df501196387314441871be06e4e63d74cf302efdbf596136fc7. 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/ARF036800053.