The Verdes Anos fado group is a Portuguese musical group founded in 1996, known for performing and popularizing Coimbra's Fado and the Portuguese guitar. right|thumb| Verdes Anos in Sesimbra, Portugal
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518599d2fce34e3b45399de0bb28dc5235cd313966a769df1f53a166210ef221. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5909d0b0-d2f7-48e8-8019-31ee3bb56017.json and https://artists.proofprofile.net/proofs/artist/5909d0b0-d2f7-48e8-8019-31ee3bb56017.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0991ac583aa14777325f30dc2eaea0447b352f3fd5d3c6e9128957f6629b2ade. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/GBCKG0801134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0956ff17e0f91cbe44b7c7cebab38f00330a6a6b1dafe38fc9b1eb4ec222c18f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBCKG0801135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9d7f011e60cffb2521289ce2be47325ba0d51f97e6fbc920f66baf84a4e80a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBCKG0801139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f00331ce76ec843855a6c832586a1540b94ee9f2e2f39ca2412c34b93e66b8a. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/GBCKG0801147.
Balada da Despedida do 6 Ano Medico de 1958
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc83e6a86c10f5ff4a71d9fb753731f11432109820eb931b6eb2fec4b8f5d5b2. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/GBCKG0801152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa304f8cad97685d0cda2ca4e18034ef5f6aa1cb3e4597a70dee3e165984143fd. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBCKG0801138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4a12b0d7f97b8ba6e8aeea67ad1efcb1a21767355ccf79185a5d178b46ad4b. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBCKG0801141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2a3dbed308d5ddf24bcdc39958d5bf9c7773b5e903a7129c0af2d4ab3b4823. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/GBCKG0801145.