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 0x4731aa1d1e7dc391afacbfa7a344fa6c74aff4e46dc8cdbd23e9c46f2a526f24. 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/b6597790-eab8-4f2d-b338-a49871a5b31c.json and https://artists.proofprofile.net/proofs/artist/b6597790-eab8-4f2d-b338-a49871a5b31c.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 0xe4a90aaaf19bbd525759f04a0b62d0e554b6db9ab9a87eae252757f7a2ae08ac. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/USHM20760945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703a6413e6efd8cc79961c0891be0205347e1a53e95aa492d1e8208fc25f708c. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USHM20760949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f272c3223563ab0ef2fb204b85ce7d733f7c9ac4d8a201d2fe6a1c0a607a9c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:28:10Z), 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/USX9P1443584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73becd9e4138a68060816a6952d3896f4b6ae51de7a90447561def74b5f7078b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USX9P1443585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4316aedcabc70f88e146c03f92f43eb97a38e68f1bd9ee6e380615d70a63198c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USX9P1443587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03e96244fe9f05228ef710e9034d3d31c6161e1f544de7dcfe843d53d9ff54b. 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/USX9P1443589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51dc4054bc6c0e43c90fbb9c3088aa2b0d1badf9253da0aba3f9a9d95dd44589. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USX9P1443591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5198ce2cd43a5fce84bd8c3b8fbb7a8b68d4e7ca101749c1532c7f92399cf9ce. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USX9P1443593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0989d10311b9d2562c331823ac19478a0e861daf0986637bae033e09c987a90b. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USX9P1443594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7100430577d5124df87429708675cc926830017d13cb48792e1c778e2372c802. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DEMB21000132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2e9689c89920ce2619188b458336e3225cdc62ba5162b6710486e4733efdbd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMZ561300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e653686def2884b6a4ad4056a4ec6665342966282523f9f100acbd7f3a87eeb. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/QMZ561300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af0a2178fa1a56bfe74eb643dd331c6da6eafd7a2400c68b9cda9e0c1b38789. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:49:07Z), 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/QMZ561300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738bd1e06e18f55ae3d47a3fd29753aedd588db17159a14606db4f72f74cc83c. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QMZ561300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aff0fce230a6792d53c62cfdc4414d1dfe820027b854854fafd44c60a91955d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USDY42221340.