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 0xe27ac987a0f7b60958185b739e03f91ae1fe416c2251308a2f1067199643aa5c. 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/d1603d67-f4dc-49af-a4fb-64748ae38a60.json and https://artists.proofprofile.net/proofs/artist/d1603d67-f4dc-49af-a4fb-64748ae38a60.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 0xe71925b13fc368070231c91b86963e67bf3a341d1ca319351facfbe8d18d401a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/CAHQJ2108366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393e3e56f146e5b8fa752f9c01931bf108b4b0e120b491eaf01e13ccb3ccd071. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CAHQJ2108367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0df72cabbe3b2e9bbdb318665b742832dcbe4d30b170776b701fdc54b0a7f2d. 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/CAHQJ2108368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e627b21d70a8ec2a84a849cb01ff9bf1b4a0849704dcd286e42866d6229b49. 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/CAHQJ2108369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966a50085ebcfbc24ca8817fd7001143ad13e4d9de9e5393be80de6bdd521a48. 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/CAHQJ2108370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9b41db89dc155184ba88d8f1e707cfa5a1d28bd118624f24c9a86efd56d98f. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:06:10Z), 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/QZHZ41920902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e67e8015934d395f86721e3c887235e1cf2742297574253ff2cc4dddd436f09. 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/QZHZ41920903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0429cd9f45b866f0bed1ea5e17aa608c60c7e303ed757ff1eb8ae91cfcc31d8. 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/QZHZ41920904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e275ad7fa36a83d0fd113ab551c5c50f4b2082eb690598af4443b4dcb2143e7. 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/QZHZ41920906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03227eb637130939c5c76c741f08a1dfb8f0c5e5007d442c4defbed79823ed1. 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/QZHZ41920907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea32238da7fbf7b3a8f9db0d80b15d5d3a48e9504eed2a4c9af5ba00477f5935. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZHZ41920909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d323a194288edaa893bf18ac761cf292cbf1c451f88c6e1e3f79a3e6fd3c5c. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:49:39Z), 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/USHM21275618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44a40a4a321da7add485ef31f6af0c2034eab6527278afe0db328306d32083c. 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/CAENV2084525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e16768bff50711e03cccfae758044d8f1bcf8d791695b78ccf93deb95471006. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CAENV2084526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f1422122a9293d261d7dfc06c8b300b21f68a606c94335cbf41f1002eb1921. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CAENV2084528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0904e8d223ceab1fc84f9c1738f68b33832290e6e428dde74da73f5b6254fa6b. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CAENV2084529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6220ed453597d9158ed71dabbc41784fa0324406ba63a7ed4db25c4dcfbc7e92. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/CAENV2084530.