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 0x1513eaa07906ec399699365dd01bc4c3eeb281deb39a71843bba76638c720ca6. 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/7a711afd-49b4-4896-a6d6-8be0fcf2f8da.json and https://artists.proofprofile.net/proofs/artist/7a711afd-49b4-4896-a6d6-8be0fcf2f8da.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 0x9d4f4bb2ad539bf0ffe2820e3c4b9915ceabbe87dc0ad8787830dd6ef16159a5. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/FR2X42239731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23695432175959ddf4c799ff18ac80164756922d2a4babd1beab324746584762. Chain 2 (Bitcoin): anchored in block 957689 (2026-07-12T10:12:33Z), 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/USDHM1100825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f19d6eb9b496af822183da164ef1d9f1415dca77b9347dbf457b4fa7368a85. Chain 2 (Bitcoin): anchored in block 957692 (2026-07-12T10:37:51Z), 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/USDHM1100826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa1b4f1954ff9587820b32e15913456053e86477e633394a3e0b6b1fb42f7d6. 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/USDHM1100828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c1baca9c300c59d84686dd8e8062203f76dad1fd0a64693876353825ed8440. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/USDHM1100829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9a2c1f425fad785beb98052eedf3f94226e2d9d8a2baa000de924eb1203577. 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/USDHM1100831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd338f6131707abed1c8a548ccaa3c0324451933c6addffbb12a2362d6b21d0b. 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/USDHM1100832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccbf745b6de1306163b3c376686dbe8cdc191838b97f5098aa332272cf89121. 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/USDHM1100836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a01a853f5806677476abde55643f04512ad614ffd131a86b387db3cdc2996ee. 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/USDHM1100844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44731870b66389fd0e370cf6ed3135e9065c3bef8e3d1b3a398207c933deedb. 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/USDHM1100846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e1133f9927328af5a6ef00fb3e474a91cf4499239b3a440410cf00fd5b04fc. 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/USDHM1100848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb392ca76cf3c1f2a17a67747afc1f7849ece427438ec092ca423138474d00474. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USDHM1100849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d673de83e76b3595a0ab729937bdef13be81e224512a157ec0554aeab501cfa. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USDHM1100853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68e7328cbaa0943be15dcf17e58be8fb417a600d96f830d6f09324973508562. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ES71G2221117.