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 0x2352aa9bb0fbad41be47d55fcb1db4ad39122d07b5a00575d1dd4fbdfc2139cb. 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/879db7ae-0625-49b9-bf60-f6af6f164d73.json and https://artists.proofprofile.net/proofs/artist/879db7ae-0625-49b9-bf60-f6af6f164d73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Los Hijos del Invierno (Winter Children)
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 0x0b88f3e23e99ab4cf7655806ddd9cceb6eb438d8a0dbb06adf522b2dec6a3a29. 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/ESA031405701.
Los Negros de Castilla (The Black People of Castilla)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531b0df1b734ee4dc13ff50ba92668def996d5e4566f5a6b42da8c4378b0deb7. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/ESA031405705.
Milonguita del Pantano (Little Swamp Milonga)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b60ee81966d937b1c0cca5661a73d9899e9dbd3a7726263614f6f95954cafa. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA031405708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161415d573e934cf21b36ef45fc1ba30798e47e26bda5ebb12144e36905d26d4. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:39:08Z), 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/QMBZ91763183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2656cde6edfd5fb4ed4c3c40c033e89547265fff6efd519528ebe34d29e58b49. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-22T01:23:28Z), 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/QMBZ91763184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d68781cf12c3a888203aa3f5a28364c93eca5168789c947126b841fa567416. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMBZ91763188.
Una Brizna De Sangre (Banda Sonora Original Comuneros)
Una Brizna De Sangre - Banda Sonora Original Comuneros
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96104e08e0f23ee2827675ab14eb0f032d8fef6f54612dea3b0a89f18a55c5c0. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/CH6542244671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb141c18d17cee1e394eafa41358c228c32abd5e5ae90dffe091329683080b404. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/CH6542367888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25c5fb2aaa79719743a92823dc09d02bee484ff21bc30d74887a4431c466fd4. 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/CH6542501119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8e83abe855b019ccf458f171deecd8961722fda5d9fa113ab4fe95044de40d. 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/ES71G2406764.