thumb|right|250px|Hessen (F 221), a F124-class frigate () of the German Navy. The MEKO family of warships was developed by the German company Blohm+Voss. MEKO is a registered trademark. The portmantea
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 0xea120e235d52838bd904508ec27d904fc432208bfb092a9921a60e63e5431de8. 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/efcf0b13-b2f9-4802-b3fa-46494d096827.json and https://artists.proofprofile.net/proofs/artist/efcf0b13-b2f9-4802-b3fa-46494d096827.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 0x3e77412379cd7c0f455209f6cae6e9f176960cb4d105200778432f5956ef99c8. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/ES6080443711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570cd7352b37bd2b2c1ca3ac42436c8b77fcc257ff9c1b42de0e817cd3c986c5. 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/TCAJZ2571171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa426ff80a972333d7dfed0bf2b1d934ee4813f9ee701a55128dc0621b1bcfb17. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAJZ2571174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b771ebfcca0830208e6823ea659d24bde7655dd8c35174b30ed678d1931de43. 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/TCAJZ2571176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99b0b725c64d9f766b3b5112abbf8cbda7a52147ec125a7b2719aa7a02a6acc. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAJZ2571178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdb3584d932264f63d5a290b43cc5688254c4559f974fa370b0b9741f4558fb. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCAJZ2571182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9419d212ed982bcc648ef582102762fa39839e78eaa91e48af23973e51d0e48. 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/TCAJZ2571183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e882ccdb235fb5dc0e1a682d228e7e86d506e9bd96dc8b58e7be48359ba908a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAJZ2571185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20b6dcff798820e9e5b921236c4a5c3e09ba073e470037caa6e8106aabfb527. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCAJZ2571187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab4ffbc090ce1593da4b9c9dcce1c188f174d5ff52813b1e8919dc47caeed57. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCAJZ2571191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2be1d29950d5527517fdbe7370da0f91736b5832164361b448f307ebdbdcb9. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAJZ2561508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967df289e2b4f7336e78e83653602a24173750632cbf61c2fd0b3425dd3348fb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAKA2561511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18bdaf54e6017c8bf8210776186d2c1bd0ff93f2a859981cdecaad61be3185e. 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/TCAJZ2561515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e7e7fcfb61e47b8451800b6eee1539ba0686d77540950b209769134b093070. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCAJZ2561521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76956aed1ee72e788f0ab31130cfd1634694cc8b6b56ccd7822dd697335dbc82. 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/TCAJZ2561523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501a1dd650a77835f7b21fb11802585b19dde836026fe971983c4dabf54e2e98. 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/TCAJZ2561533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1623313b2b389f9fce525d46efb35df672c28b8a107b377100c9110c4437eaf. 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/TCAJZ2561536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d04f14f1ead73fae6eccecb417f2785012ca3603c1435a79bbbdb55cd62e51. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAJZ2561542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee68f14244734fbf8b06fc233d47e2c984bde940dddbc5438ce2818813789590. 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/TCAJZ2561547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbec8d1898a8cd28cc4584ddeb19f0045dfc4c119565dd7a5dab10b992d6fbf2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACD1522995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe074640f3e5fdb31adf6985bbe57c92d98a8592a23c45779046bea7e8ab870d0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACD1523389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d31ba9778ebe25f38c29a1770c2d3ccd6211a895d7df80aa7a76eeca195aa5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLI368120670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5e3962a99c322e497ad9b92be52774bc8f802315e2ae6b4e7e648ae1e6c9a3. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZW9M2475351.