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 0x9059a6b8097494e39b13e3edeaf04f894452c0cdfeb3cb7730279d944bf0f670. 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/4ce7a845-fa17-480f-a4bb-aaffa6ec39e3.json and https://artists.proofprofile.net/proofs/artist/4ce7a845-fa17-480f-a4bb-aaffa6ec39e3.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 0xc92b8390520ad52eb9bbc674e592231a7bcb9df04e68796c0ff217544a50915a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BKCMX2400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f9e905554d4f0449380e516f59dc86d644acf3c27ef32ac4537c828fe79423. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/BKCMX2400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b03b1ce0e6173ef30983726c9fea70c7e1048c26b099e8fa18595e9cdb3399e. 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/BKCMX2400149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc51b410dd15d37db7c76aa8f266f17d98bcef5445d97f73e0212b59bd32f36. 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/BKCMX2400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5e3c344b543352f1a3977fd8c033c6fcbe0492bca29a0fa67747096e95d249. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BKCMX2400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016bb426c809d2620ea6f7c6b31426a005a0a889126dd5787dc4e10cac0765a1. 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/QZGLM2424525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe781ab3ed38c6632bd1fdc4630c2e26ec0b5c23be22b86d4d20480c98ec9142e. 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/QZTAU2367254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32db13752412a89ea5643bcb6879d9d962ab531cb9fe6ffafb24fb92b139ce37. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BKCMX2300139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54eebd7901e935da9e65f28d6a807e7200f7b5aae1d124c5b1228cea46b28e97. 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/BX4IU2350486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab3e3c5faee57b9c3bb5ab071f1a805ed5256e3a7870aad884bd855da516139. 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/BX4IU2332371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74b0ff81160b8984c4159326b194c3deec2a88485416b1649189d42be180039. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWDD2481248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb770358efbdddfd922c21b940ef61631ab7246942d9b256085b26f55bc8608. 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/QZYFZ2415420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82f4256c95f9cfb63e7feee309940c47c53b4c003cede4aee1c748c8db708ec. 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/QZZ662422924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066a0bebcb8287c67989d2e4f510b780a9bc4edeff40dbce1ccc145c07c2dd89. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/US7VG2412793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95407275703e4599a49ac246fc0a8699d6100be2228a4cc27d2e597449093635. 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/QZTPX2383439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9971140d68221da9ac10a8909a6f0e74967171e310454062efd75b8e0a6dfc9c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTAX2315495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149ec474e950f268b7b261d29b72dc419c0b1b08a766706840734f419a975ef3. 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/QZPLS2381073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3722b9521060eeedbd7a9ff4ed98d9254689c56298a6b706f7552be54cdf8ff0. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/BX4IU2318105.