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 0x02e7412e96da54c9c753dac07e4f9931920b053f2dd1b58f03cd77c73f65dffa. 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/f516885f-ab41-432e-8b5b-f4f3a3b6f193.json and https://artists.proofprofile.net/proofs/artist/f516885f-ab41-432e-8b5b-f4f3a3b6f193.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 0xacfde282a00d1d02307cc00facd8818e7133964cee0a30d55d686be1d299d2c0. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/ZAC031700576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9402387ef44efb41ab8ea3a98e9ad0d2ad5a19a98a5aad41a38285886696d90a. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:08:10Z), 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/ZAC031700577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ed890ce44d889afd0a3e495cc896f7754f916d33d1c0b1f35ea2e6ff0802a5. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/ZAC031700582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92aecae05e1d552ded418d649a62ede802bb93cc2dc1adbc17dfdca8149d8d4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ZAC135400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1de7c454b1877972a71f31455f43641c22ff869953c07ddcf057c7c6a516575. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ZAC135400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2acb073798f483209f623b6b72d39912b7a9847ab2447de389ea390ee4b6c933. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ZAC135400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe552ff1e96feaa47fd19a628aa61dd837c9eebe4c4c3a024496ca28a0f9a92e1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ZAC135400182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac16fb8e30f9e25bc8a5512fce2b441dc8757158b2e3d07510248432f5c36c3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ZADW51700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c6dc63d33edd1d2dbe7bcd359cb3941915ca371dc8e1b12e6244f253a032e0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ZADW51700017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3370c4f25204df03bd624565e33177e2f527a9c864b2989a34b6ce91b0b997f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ZADW51700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd29c59c55a1cc22dda7dd77cc241af57648b13140156147479f31b097ba6db7. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ZADW51800269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a9fc80d80b7a4c2e0ad6399e160c752ef8d7648e3eb745f0e3a2a684640cae. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/ZADW51800272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dae249295b17b11f6de2cdb26d6667a1af9a55afb74aaf7884fe8f480a2539. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ZADW51800280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1911117a4ecfc09fb139ae42e175e8ea8e21cee5465015e37fe93450598960e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZADW52000304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf951d7755303b4ba0425000052f6283d751ca059a105661402b97f9a46af03bd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZADW52000307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d0bcc389bacb363b21100c4eef3e64e6a4b677519ba70e49c73640b60dd1b3. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:16:39Z), 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/ZADW52000308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612a824942ea7c6924d2cd35cec1a347bac1f5441b6cdeb709c33b53da4e194d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ZBZTS2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cf04c39d6d977f8906a1ac9413448aec909be5bd529f1f5142b314dd397633. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ZBZTS2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349b8a84a501e529e06f64960a5a57ca1f8cc66ffa74fdc332bfaaa5d480d2af. 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/QZFYZ2086016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf119f7200ed508d0f9b6f32b5150b0147704a906dc455a22535abf20a2b4eedf. 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/USUYG1519995.