thumb|Duendecitos by Francisco Goya, 1799 thumb|Model of a duende A duende is a humanoid figure of folklore, with variations from Iberian, Ibero American, and Latin American cultures, comparable to
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 0x945636a381d61c2bf1562df1dd47abaa8f788735068c47e5df6976995d3c1866. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a140dd5-2824-48ba-a34e-9b1395d18e5e.json and https://artists.proofprofile.net/proofs/artist/9a140dd5-2824-48ba-a34e-9b1395d18e5e.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 0x27cddb5fcf119022c0ebe8c7600308a5818872bafd330055712bcae17d1dbd9d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKU932300412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830bbe2a4d3feef24320f8eb358b19cf7a33e0abeebf0c75e4f9c4d3ca16119d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHZ51954095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbd2d64e5c6ef13140a1f40ca6976bfa5b851ceb571414211fad3fd2e4868d1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJY2245179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508240a7cb0eed7d0f19a04422ac2a4a3f825848d3b9c790a3d7b17427aa077b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKU932400277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44d8758e20e53e9c12fa791ab77160e3ae4e89205305e823a88150be63216fe. 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/USDNB0343302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504aff1c46d3c321875258e446b88ed483817f56704d59eee59e2e5ea63395df. 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/USDNB0545302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960da98cd71ccbaf8a9478d3bf5cf03082eab189f16db6313deb98ba3976969c. 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/USDNB0545402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce66a205e3c98f1180852a5a7bf18e507be459d117c2fdaaad63a804093d3195. 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/QZNWY2182295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96457ef2c206126752c17b95bda6cb2c172edb65bf55e65f54688cc05a34770. 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/QM6MZ1853653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6637416c8a4cfb0d005ea1deb1663417f51c8f1bd7f5b6245be4a4895f91f326. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USDNB0549002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763ad86759ee82aaf0b9316b1a45dc682f2f48b485938a143b3c067277f23779. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USDNB0549003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc502458f646df007ce15611b4b91f4fe8237b0880c149fd0f58d1c76834363b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USDNB0549004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2559966a6b9e37822d359e1946f8916a8a814593851297760ef09a0223fd743b. 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/USDNB0549005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe661c48545268a558d9669b574cc117b62d93eb3f4abc95209ba327bd906662f. 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/USDNB0549006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78216de27375701957d437cff32c3704de9de7e509200b7aa414542df7b2db67. 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/USDNB0549007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c8d7d599062adc2c361901f79a1ac663c2738a5c4af0872a82b39f52724928. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USDNB0549008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6fc65070731844cd9190b2e982549949a2e0e53aab1ff5a6b16411c99a5dfb. 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/USDNB0549009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68bbeb91723a0b8d015f7bfe00d9bf4d79fd2dc6d2647e547b8d326c743fef5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USDNB0549010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b6fc6a305865ece70203acd3914610b8ee54eacfbcffd7882978dd2b353f2d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USDNB0545317.
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 0x3c5b9bcb9ed8454b2ec3ad32219f0671a323ba04604b57573125a8e36ea6c900. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USDNB0549001.