thumb|Copper roof on the Minneapolis City Hall, coated with patina thumb|upright|The Dresden Frauenkirche. The church was destroyed during the bombing of Dresden in 1945 and rebuilt from 1993 to 2005
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 0x827f33422cb58c7e6eb093c11491c794ead984bf29f40811abf30f483242eca5. 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/e00925aa-e6fd-41bc-83d4-0d6eb810728f.json and https://artists.proofprofile.net/proofs/artist/e00925aa-e6fd-41bc-83d4-0d6eb810728f.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 0xb2f3481488b8f9554ce2b19d998096797bd369a08b2e8c359f0618407a595690. 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/DK4C61800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e99cf79e9cd6139699412c3baf172b91a8bb0dc836a69fcd0833362b3d1cfb5. 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/DK4C61800301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff110a363057c516c67482427617438c8ea6f26f8716f5545bc8faa46f05394d. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/DK4C61900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf329aeb6f1718308189dda02131f39c7b31d4aac665eb2fe87ec355632432898. 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/DK4C61900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47185a08bb53f23ba1c809e144df49c3f31c6ec5d6776ca586933c323df508b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DK4YA2118304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5198ca350d44c39fb3874ae4559de872e217d616f713a85e27a5ba2fcc1b2e6b. 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/DK4YA2118307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d6d6bf82975e2c979a765e1925b7c875c47964ef605d461071d6ba1c4f89c9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DK4YA2118309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46554f443f068a249a38589ae9897a956ac844cc14b2c7283747639959256932. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/DK4YA2273901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68611c58ef42d3c2f610f3751584c3df6bf97463162bd991527a08b51e49632c. 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/DK4YA2273902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2022c6a689a97682a635ee5be534d3588b7daf23c8e0e6e0e5b85c26206011. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DK4YA2273905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546c88c5f3ae4f3fe2cb8088bbd72e91b327562afaf8fc591eed385240b39e80. 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/DK4YA2273908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1239fe0ce4620ea484f31b213b89a5de6ab2f84c119820dc71f02e5fc97b19. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T16:05:59Z), 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/DK4YA2273907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025f2d06a9a04204359cb83b27608c70ec73394905dcf86b7eaf6201afa4bbf1. 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/DK4YA2273909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acfe5aed0701bd2014fd74ec92adaf53078e94ac6092b53e7f9ea2578e3b46f. 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/DK4YA2400247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55852c008f2e4e9e0d8673641d6aeec3b6782ac7de6508db6ec8c584c8e2dc7. 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/DK4YA2313301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d102d82a7c2e105de232af750771a6bead26b885ec7be07ae17719dbe66837. 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/DK4YA2400349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64232687fb8fe0f72ad8e7149b7ccc4fda52c0c081c65f8771d009af866454a1. 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/DK4YA2400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4105ab04c91efe41032bc580bace76d4e17d7187da6a28a1698b1c67bff92960. 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/DK4YA2400351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acfe5aed0701bd2014fd74ec92adaf53078e94ac6092b53e7f9ea2578e3b46f. 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/DK4YA2400247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55852c008f2e4e9e0d8673641d6aeec3b6782ac7de6508db6ec8c584c8e2dc7. 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/DK4YA2313301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ad4b7ae369abcd534b707548b7cb556b6f418fee438d1eb8262930777371cd. 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/DK4YA2400352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158c2b37e5ad52ed69904740ca2ccd577d2a42d45be3f2f4c3842002be5b8383. 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/DK4YA2500168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f00d03b50901d6f1ce0c32f1d9d501593496409fa3900c391f5a5680f30dd8. 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/DK4YA2500130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe532cd7b20e27fdfee78c74edbf775280301ca92a4878c128f4793e3cce9fb93. 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/DK4YA2500169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a989d01129454ec31e27c882761d21380c701c666a6d54c104b9243fd19f161. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DK4YA2500170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf818fa92b83b6b48688d40aec02d05bd5f950738e232f182cfecb2f7ce156ad5. 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/DK4YA2500171.