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 0x0e262ec15093037e6a7d5e7d52f6d2d72dd5a992dbe8e070d4e52006e510535b. Chain 2 (Bitcoin): anchored in block 953896 (2026-06-16T06:05:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f61878b-d43d-4bea-b8e2-c8f641ffdfa0.json and https://artists.proofprofile.net/proofs/artist/0f61878b-d43d-4bea-b8e2-c8f641ffdfa0.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 0x390aa985c33ad03d3b6869190cdf575b8e12382688f426d50f26209f86ccb5d1. 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/ARU671100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad01f05ceaca21b95d069a6da0afcae4a82f6919805f8a84c27191c02d40e71. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/ARU671100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a862b61057d570331d8674db5703ca3cfc039dcf97b52be30b58314fe717075. 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/ARU671100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2ed847a6116eb08cdf8e2626ec7e342d8e0265a8050ea441d97f54af4fa2bb. 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/ARLM81500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d2337118e7bddd14c2c8e427ad8c2c968d53e28cfa40149fbdd637686de2f0. 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/ARLM81500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461fe80f06106a0e9fd849af8ebea61e724c2053b54b98e1c4fbc0b15191ba4a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ARLM81500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5172b7360773bd96ecefb3904a9dfbccf8fae63011f5c3e5ca51ae8c193fe012. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ARLM81500011.
Coplas Tamboreras / Tamboreras Por el Mundo, Vol. 1
Mujeres al Tambor / Tamboreras por el Mundo, Vol. 1
Bombo y Pandeiro / Tamboreras por el Mundo, Vol. 1
Doña Tambó / Tamboreras por el Mundo, Vol. 1