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 0x6d2d266a827e15669a37fdfe9ef7807fb75ebe330e0daad3ea53a9c7fe4d53e1. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97d9fe2b-85d7-4175-a54a-a4113658f685.json and https://artists.proofprofile.net/proofs/artist/97d9fe2b-85d7-4175-a54a-a4113658f685.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 0x9f17ec60f88e2bd7281d3e598763feb57dbbc0b1d6602915ec9393e8da2dd93b. 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/QZK6G2557315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49b356b18498f6a68ee5594bea8cf479f8c9c7e28576d9e662e3f92cc535685. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZK6F2575726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7712ec832c904eddb62c967aa4db69a9a740ca09851607f7f817eaaddd09681. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZMEM2555207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc131be508b39c8900fb19d6be13df94b52227d5804714f790dca9eb989f64932. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEN2530217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eef9737ca6a013b1c00c45af6f75ec22358dbb92e7da8c2c43958ef38e75e23. 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/QZNWR2567312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a8fd12558423869c6bd87495488e5af076390433c0f44e475a2889b5b4f3b9. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZNWR2567313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bab62b28908385d0e2cf5a46c6c8d5d202d8ea5e38cf99869945ced1771bb0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWR2567314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb407454c80982653620856b6fa4bcdd90d54fe4f156d3641e1f0e75155a2bcc6. 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/QZNWR2567316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49b356b18498f6a68ee5594bea8cf479f8c9c7e28576d9e662e3f92cc535685. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZK6F2575726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a80ea7109fc0200c3abc2a3845b709f6c837c23ee151c00bf6c7830631de4d. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZNWR2567320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ae3529eeec001c0619144c73dfe666ebb43aba7a63d9cfa4057dd7a6832fe6. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZNWR2567321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152829230d6a9af7479a87d48cad33314ffe3bbaa12b5072c89e2f65544f69fa. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZNWR2567323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66e6227995c985dcd8aeddbc7e92bec3fcc90f560e2e99eab44306368e15acc. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZTAT2581764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4476f1cc6b3cfbee84aae56446f6391d688fb3897e7537bc6af22b8c5b4482b5. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QT3FE2534111.