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 0x0dfdccca06afe211e3aac38c73c7e217e9af2914e286bfa535aba754956591db. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/301c86fb-ea00-4039-8708-5b191c77d158.json and https://artists.proofprofile.net/proofs/artist/301c86fb-ea00-4039-8708-5b191c77d158.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 0x2702eda3701bf42ba622ecb3c35c5db422824e2f6d49e74caa6edf1054873dfa. 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/QZFZ32459567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbceacdff6264a38a89976cc8082f3a3e21856b1a40b2615acf79d06d191dbc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTAW2235518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac54e7e5c961e1e326a4eac66f3ab63eb3c3eb92aad874464a906d7b9000eab9. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZES52274195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf73a1164259472c613e500aa3a9c681a4794c350433877829ee09cff43478f. 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/QZES82125598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358a6ed4d48ddf58515ec662dd38806024b6a443583f3911fb433f991c0d4027. 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/QZFYX2165908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41ea23c0c9370d42dc5140eec02e098e64e2dcb745fa109e4755c1a7082078c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZNWZ2042864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71c26056ecf857dc77b75c2e8c7411bdda9503c8f17910d803c4d4e19671fa2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NL1AP2081387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f20b172574454d26e4b2dc6290589753b8221bcc3beb4d134324bf6e093dc3e. 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/NL1AP2028764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012538815ebf126df83bdf4d75ac43511f69e3d8678a1c22e18085fcb887e0f9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NL1AP2028766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83983790b2fb40c73f5a7660a9fb3676d5fc34535df882f1941fa2f8d1146ef9. 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/NL1AP2009870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173a01614bcaaf5b1a7c5ec278b969d85e3e12b6414f0333d8c412e0e9744477. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NL1AP1985587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1c7793c3fa6cb524b6d48f5f1bc529bb822f642004032808bc770641d5e459. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NL1AP1964230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac24e32c12fc6debf3293fb44d8ee7e809bb3b3caacbb4ae26f7218d5c10bf2a. 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/NL1AP1911947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791d7c443e9b91847aa204567aa2448183c5b3973998855d2dd6ac1a02c0a5c3. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLS6R1875975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0031df32ad1af911f78004b1b1c8922e2ecf02f996eea4336ff187a7978deb5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZK6P1956020.