thumb|right|200px|Grave of Ignotus, born Hugó Veigelsberg, in Budapest, Kerepesi Cemetery: 24/1-2-72. Hugó Veigelsberg (2 November 1869, Pest – 3 August 1949, Budapest) was a Hungarian editor and wri
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e8ac8b00a6099b715230096ac0aec667349607a108e9ce84666852bb36d0f0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a943ec73-f999-4c24-a0cc-971675b06419.json and https://artists.proofprofile.net/proofs/artist/a943ec73-f999-4c24-a0cc-971675b06419.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1431cdce4e22dfe32ba74493265732ce57cd54e6ee72054c8270b2f098071455. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:24:55Z), 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/QMDA61320918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bf5b0a44a49e2101520a5b3933ba40838aa2b0c41106cbeeefebde15e523f8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMDA61320919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986e14c3f993eb669e39b1809dff52045a43e32aa71695bfc22796c9157cc39c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:02:26Z), 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/QMDA61320930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ce2ef4a988c1b7266a2ef4aa377af5677b2d46f114893c535570320b31afa7. 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/QMDA61320937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526d5d12f6d8b8ee8a985958cb8c95e3c5b30b0a66390ce072fdfdd07d73e13f. 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/QMDA61320944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b312e3c53ba8d60f9fd97b986105a4d29e1327548cd7a1a7b3dfc81e5731f1. 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/QMDA61320946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f58c0d2f11e47b2b2fa66be71fa3d6cbd80fbb0e42943bf4cce9ea07e0cad82. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:03:07Z), 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/QMDA61320947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191c84110c8dc0d1682bc819e6943e96193b6a59f60eb8221dd0492686271658. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QMDA61320948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06aa58f007525d69acaa58add860a1afb033f91ff0a3ba8f07323421f5d02cf7. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QMDA61320951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903241a505adafe64536924095bfcb552dea57b819242d71eeacfc68ba5ec296. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMDA61320956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc020ce15b823d032c64e124c15e48c0d7cc07bfc46796863b1dee15b4c60710c. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QMDA61320958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75554953ca25dd3429a4fcaa526f80433e7f8cc9fec11583ae217ddd659e5b96. 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/US6R21406654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa490bcd6bc608d0d7ee3276183afce8de20e3f81fc730ae27efe701f1c6f8efd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES31E2200345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fe7c62ffa253a4511d88da0a09b3f238d481fd6a002d9a0a86a8e2a479fc40. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/ES31E2200009.
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 0xca15039f3286264e3b07b5ce33c4fa277e3de90679ec22ba456c8d5d948d6990. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/ES31E2200420.