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 0x157739c9d681e4666788fcdad96bbc47288e8536f38dcbec2fde1271c1edcc1b. 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/f64fad4c-aa2b-4144-913e-3419ef18c7b2.json and https://artists.proofprofile.net/proofs/artist/f64fad4c-aa2b-4144-913e-3419ef18c7b2.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 0x5a5b5bf16390d0934f3a488f2801f73fa3ec5c3df5a80245555fad0b71c371b0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:06:10Z), 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/QZES72132816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcc8f4641f412097f2f9d8c919a490cabbfa15bb0d9766b61431d4dbe8a55b6. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:53:11Z), 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/QZNWT2131511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607070ee1bfb35b2b60ed43f450583e76ee44b9afa602ded9dd0d48d1f5e97bf. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T17:32:40Z), 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/QZNWT2138107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae0436f10baee9060366dfb3c2fa0ccd101e7ee4c1b8a9b36a0f252b71fe9e9. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZK6L2236273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48da0bce07ffd69ec070963c07b0be5bba7b83cf9d019f1fce3806826986d64. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZK6L2236276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794a0f59873c1703fcf0326867a22f1fcb9d356b39c5f91e3cfc1517fc4f22b3. 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/QZES82295055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a7e3d85e19f6c2d56f0b03aa5a4a8fd4b15d5a3db045bf731d4286ff9c8a20. 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/QZK6H2211327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d95c2b1e977d5aae3b9b17dd9e357e900f9eff61334040760108c3dff11817. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWZ2245502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95222b6298f9ae75d54773212653ff9c1c5c5d0e1342491208424f40f6e8002. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTAW2265706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158da3c6e67e398227f65a88f31a0f4c53b774c21f349bf860cccd0bb921d836. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZTB52264150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbe65069945f1046ad865d41a3c7ab566651b0b18ce870856542062aa4e0ae7. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZES52386674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8b75b2859e0c0a04020da57b3afcbfc2e971e981b858f21599a6255d50a6ff. 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/QZHNC2346224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7299c8dad898023614b36de355ff50cebb0624643e0e22171812923e8134435f. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZK6P2332575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50e5cad0594eb113347017ffb8f9bae1d7e005086dc51285f63aba17f3ae639. 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/QZK6F2303734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4728f46c9fa6f38aa3e47d7ab95702c5932b718c460040f1a92506f8b8f135. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTBA2381424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f26d75b99eff00e4112263c61a3313eed0064e214a360f5638ec38b76bed589. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:55:25Z), 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/QZFZ22416355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369a4b72fe9e0427b02691701f37d02b87f5018fc13c57b54b694ca2f8ee69f9. 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/QZFZ42424318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0051ac6126457b0656e87841a5dc83d2c1457aafdeafc9417bd1c7bdbaaf9b1a. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:00:07Z), 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/QZDA52408258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c98a12d1fcc51bf07cf0b41ce1d009736819b6c85ceda56978c74814f43cb0. 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/QZDA52408259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7f5c713c449bec73297831f839689f314b772eb6910b8ec3252df230cbc011. 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/QZDA52408260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179dbf81bf541261234d4a4265aea96bac2540163ff22dfb9277d5a7bb4a4697. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:02:19Z), 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/QZDA52408261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4e1bae2a3cea67c36f8cea130f87fc5b08252b2868e62d07ccc2460312a230. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZNWV2334317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff77bfbd722ae9ef734a3b39cd3b2a7dce6120abe7d149afd1b9cd58afcb886. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:05:44Z), 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/QZHN32458179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776bf517022703e5f197d99807b52835e76e6738cfe0a737632561e90596a898. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6L2475132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11460414e05cea17f6060b3705fc5cc449ee79bc36f338f30cfcbb165bdf4c3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:34:51Z), 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/QZNWX2472929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685b188cbc094d53a95524f0df6694395530f07823e057a381f7d72855595c92. 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/QZDA52563300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667413048ae1d8bd0ab6d87032dc4a04e03009a6b012d006087b54878e620c54. 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/QZDA52563301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcf27db0eed4b9a60dc8fdfe4f3e1c4a8b350250a1dc57d179a4f5d75ea1527. 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/QZZ7V2557865.