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 0xc99b812a13cf303ad1b61614490a0ded9fdb28aaf488b4cee9246897a6646932. 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/1a925c3f-51ee-4078-b5f7-2cf2ee3c599a.json and https://artists.proofprofile.net/proofs/artist/1a925c3f-51ee-4078-b5f7-2cf2ee3c599a.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 0xcb112586120a1534aeac2231cb2d52cd9d74b1ad1e719968b33bd18d5b544930. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCACQ1633673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563e6488187d0b2ca9be76aafa6f5160719c65f62dd75cf1b832707a7e466400. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCACQ1633752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf609783f4448edcd925c8776521ec9ef9c03bec564dcba73cc66ba2f8a7cf508. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADL1835882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8772f7c700c2d30dea819680d60256520fe1b323cadea67d846d7b9764238d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCADQ1896710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535f9546ea31a9634e2e17288aede8926f72f10fb394c52638d335ab7f62f995. 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/QMBZ92026686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb487f6d7b56a44d2312e9e3cf218664bf1f2b2957d3175200034f2dfbe49084d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QM4TX2285608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535f9546ea31a9634e2e17288aede8926f72f10fb394c52638d335ab7f62f995. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QMBZ92026686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dfa065cd3f84a688488c52abe3423eee8d5eaf347cc3330a42d8bd8c6d2b77. 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/QMDA72125198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4ca8284d07ed3541f9ca9ebd17afc9157aa9536e2c670957937d9867360841. 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/QM4TX2285613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e127103fe38056ae652d7a44bf15c6dc3db1f43a6307b9ce02427a123010db. 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/QMDA62218607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb112586120a1534aeac2231cb2d52cd9d74b1ad1e719968b33bd18d5b544930. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/TCACQ1633673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8772f7c700c2d30dea819680d60256520fe1b323cadea67d846d7b9764238d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCADQ1896710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209735f08fbc80840e58a59b079d9f278dcc8cfdd11f821fe5c89d555c456466. 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/TCAEI1986103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253509ebf1604d09d86a40e3588752dd3ff8800f4250331f1184023ba560b74d. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TCAHE2348337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6691c74f649ba205dc13e10fbaaa68aef37493e8b1a0865474773b53920a07aa. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/TCAHE2348341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e745cc61c6b81be14c6ff8bc3e02c95c17de5dbf2d510c30df2c713e662908. 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/TCAHN2375318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d1808c0a6245ad074103d7cef866875785b9b4098d69aa38a98330aecc0028. 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/QM4TW2399773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d17427e88c46ca3315e056ea5cef38fd7a6bcdabbf9de36bfa29f9f97a2b81. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAHP2392159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880ead6215472935408532dbd170bc4ee0c155f98d685959cf7f2e6c8e7d48bd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM4TW2312105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c2ca47972a134b3a202a3bd5575640852ae67c8e4b2829aa95f63e6a263140. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM6P42321005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af80137c700b5312a0e4383c7a37bcc8352c81f2b40339176014f6cdc5d650b. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCAJT2591089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8224334661234123b2b88a7d1042a6f2c43658b2ab9ee4a8d3546e390f0eaa. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT65Y2559402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe472ab8f3de7008c20a4e72812f76f064a7235416a880150cfc2a1694f71523e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAIW2454270.