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 0x3ad3973260cb54e6146e07df8b65f129f266d29450e1cd2bdaa4bc33a9988067. 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/46d53547-c32c-4f76-b284-43f2dea56df6.json and https://artists.proofprofile.net/proofs/artist/46d53547-c32c-4f76-b284-43f2dea56df6.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 0x114d18a2faa52cff13ff95a8582e271cc53aa91be3b192cfc6a87a5ca2fdee4a. 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/QMFME2015758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd8595543e87820b30af3ac33973be62d607fd2b40bf793ef1e840852463e23. 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/QMFME2015769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f853bc2a4c3de5716f4e23377fe014007457a788f3f0d7701a6f63bf9a15be. 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/QMFME2015759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69e013ee16ed0668739b814a3786cd822e08bf16f4d1353d5b2f241b331dc7d. 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/QMFME2015770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67559f90ed82439dd1e2696bbadbc5a12599b7502f88a77ef9a1efa2c98ea7cf. 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/QMFME2015760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9c51659e62308efaffda30a32a4ec5f0ae140087e6ebcdb2e68c32a9daeac5. 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/QMFME2015771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfdd78fa12d048f7d7392ed59bc1b6afdbe03de07cf5c6b8b6e2907cbf9df2c. 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/QMFME2015761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd08dab14309c6408147edd06d8762eb0cf94b2bba641cc3074927b38df5b86. 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/QMFME2015772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3883bf3e6cf84779287c5f9345b627fa44df7fa9fd306d1974f3ebfdc7b2a064. 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/QMFME2015762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a144355491fa06df281cf9bbcc8208c4aba96d26475c38b9b388a97fb86ff50. 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/QMFME2015773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b55e282928d7d48b8e41ec96cea287dbe6119b4d75a869ea081737114ae44d5. 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/QMFME2015763.
Has de ser tu mateix (Cançó de la Cantata)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bb3661eb13cc584e252ab7cca504587ac9a817c530622c3277b7aea6d68fd7. 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/QMFME2015774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370e34603f9e870bd4e978a0bcf2a44ff86dfca5ef811463efb1d50a116a64e3. 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/QMFME2015764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b859dcfc370d7989416687526548c0d27ca506e03fb06f8f3ccd9062e68c6a. 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/QMFME2015775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb65d79021de9116784cdcd2e367020e720702b563cfe6e1ba040a0968c4a06b. 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/QMFME2015765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3cdefc3a07746900e59675ea8c674885da71824ada349e70eb6ca5c5da27f0. 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/QMFME2015776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb0a3122457cd8287077b0b66d39d18b452d0e23db4d9c4d52b1a31d9f0f1e5. 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/QMFME2015766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475d9648cac45e26d2053356d1d44f111bf2ea31d27fa985d2517b0fb8876e02. 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/QMFME2015777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c50eefe2db142746a103dc2d02b477b56ea5256b02a15bf71497164c4349fa. 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/QMFME2015767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc1c3c3c056bdb12495f13155ecbd091b196d92ad4a316632022be47f944f17. 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/QMFME2015778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8d80842837fb1784dfc8dabee2906244aceedc990a66befee26a6ff9d7d8e4. 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/QMFME2015768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21156dbce9c0beb09a54015ddcffb6965cad14c6cc9759735ca44e40a578885f. 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/QMFME2015779.