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 0x0274bd5646be8756516ac5042279008a8a65f3bb2961c09e669d7029b7139734. 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/412f2949-f041-4d0a-b389-586cca9b6ac7.json and https://artists.proofprofile.net/proofs/artist/412f2949-f041-4d0a-b389-586cca9b6ac7.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 0xe926773dffc0e87502e9ed3425fcd235c576036a3ce36925c233d6fa4288f1ef. 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/USDY41504851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5445001236089158e0295dd1d1db8796824be318aec56a192272a39390c4c4. 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/USHM21586753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4de8827dc8cdbe8e887b33e5e5e064551e29e6cd0b7a332f5f87cbdaec7854. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USCGJ1609041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe367452a61eeb9e62e8cf87b6b2de4cba09a6b3856283445322495c8c314b72c. 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/TCACR1621774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a123b3a9807f6904c513e5c6cb06f057d028f6de4a4e4fcbbaaf5bbc963016. 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/TCACR1621777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0c0a788a76b03886e94234621e8587eb94b74805900f8ef84250f7e6d8952a. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/TCACR1621781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec199112e3f197ea55a20d664f6f93bebbc126515994fcec30e5aabb09691b9e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCACR1621784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9bbae7dd8c60de8f5a3557449f9c633d45c09299b2ba5cd6cc6d01c08024d9. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCACX1730914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac6b75211ebc6a1e4edd88da69a855061af637495b554aebdabcafa92dd1de3. 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/TCACX1789931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62a5bd049baac1553f856f041ecfc1fea31c432391b381a42e9bc90bc053028. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCACY1717001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78b47acc82a419b45bb931161cf0739002e0e1625f956637adcc006cb8833b5. 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/TCADB1723803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc248a881310ef6fb5eff2b39165db2416e26e6f7ed874e7af74d61d0ce11f4e2. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCADC1740183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4a32e68eeef1f1d9e0a6487789be15185f0366914bed72777501241abf69fe. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCADE1738535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35485be627854e85496a346838a87f4ef97996b39f15603a3fef4159a3edc563. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCADO1875468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee116bdfc6a9013504ae263c7a94687d68464d90f5dcd0fffa92554acc31457b. 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/TCADP1891539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19477ba98764ec69289692f16a0813587bf48dc3585df977c4a14f211a260a9. 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/TCADW1873377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f855259778ef39a4000231f40dffe8000c2078044695be4c0a226ea77bac699. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TCADW1873380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6289f4d4fda5b3d4ef3fb25b5fef32a1aa69cd6e0ec2759eb2e3942d2ba70b4. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCADW1873385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b36dc0631d5267fa77655f4ebeffad044342d482f392ce4f59d1a84d71d39d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCAEC1914773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78657278f5aa4ed11f95891a51df8e61f941423da4d99a44622bd9b172a3eaa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAED1941756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d2f25d6916c75a06d86a6e606c29b31f12dcb53dede61cdc39fe92c96d441a. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAED1991906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb96da4a388c3f2fa9d79786f43ef1d3d8aff8128043849b249fcaab3f768f8. 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/TCAEF1904554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a317a91b70052895377aba7ace9b9367d17a2e5eedebda9b854e8c42af2533. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAEH1985384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a17c4faa450849c1e668c2eece645b51a20985ae965a4a9159d2bf67bcb895b. 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/TCAEJ1912356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56519eadadc9875fd5afb4a978fa970e858fbdeff023b5a41103a884c8eb4c3a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAEJ1963692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b12522b61e23702e34e6af695f458530ca222c7800229c060756aad80748511. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/TCAEL1933918.