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 0x855cfe6c27513f27f8fb2e1a719b13c404406bfbc309786bd0ec8e9e412d4a2e. 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/e69981f2-8dcf-4582-addf-3e5b4bf610cc.json and https://artists.proofprofile.net/proofs/artist/e69981f2-8dcf-4582-addf-3e5b4bf610cc.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 0xaa77b14223f94e1d839f1c5fa7ea3c2bd2d0fbce2679957fcb4bc7ba242d1b61. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USHM22008330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9c39a306df04f9c43cd91d1b21f461194ef27cbbbb6b815eefe6213341770f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USL4R1928543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4870a70d1ffa0a8b32961ba01d10caaf9af13f1ea484a8078e386aeb8ffe0a. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCAEG1908354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519fd1e37f225fb4fb5cd2f80817e86a9440baf85055ebdcd578190d9e56bd22. 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/USHM92073352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa77b14223f94e1d839f1c5fa7ea3c2bd2d0fbce2679957fcb4bc7ba242d1b61. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USHM22008330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f08e7b09442d7b4e1a898c987430a02e0fc067c7e496ca62e5192c3b931fb9. 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/USL4R2023913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e184d861351ed6e6f8ec539eb55fbb36fe984e58d8867607f9dafb0c856d138. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4Q2087369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1e4fff83e13f4206417b209370fdb0d8be8464b61af8dcf04a4ec083ec6d19. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USLZJ2206502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9608b79517dd64e885855bda9946cf3a15e0fcb55a2aa6a898265789045dbf76. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBRKQ2233734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017878118bf51c1e3aa3e904cbf986f9138f0a55526e127a550182a6f4054f21. 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/GBWUL2113608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba157770a622f314f0690abb18f566ad89bacfc9a158b97eb15c3730be76518. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZTRX2245237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6793e351e345398c8c3e95486bef7c85804c4452cbfd2b55dcd524fa51e7b778. 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/GBWUL2293997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9787217c41761b0ab8bc031d04e1e722a3d8071675ed8d8d74be71479eda1fbc. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBRKQ2170420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e1a8f680ec2cd11516339a5b9610d052e0d41756c23b6a24c62a1c8b34e70a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZ5FN2355883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a2e9aa7fad8e33162b8c782b41db765208a099c162af1f81821a03652d7c2b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZPEW2441985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016924dfde835dca500b82a43c04674137415c76adc896bca5406661aa8314e8. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZZ8A2524156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbee7aa5530ecb7cc796e716b7e8240e95d9cd2d1a707002ca6a24d6eccc30d7. 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/DEBZ72100153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80e0b65a38946259f5baa703d8a942cd4d9504d430002ed1b4434b3b57916b3. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCADG1778209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b0811858d68120d8abe3e119b335275d52bde36b9b9f7e288af755e57f1873. 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/TCADG1778212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23413c514efda550e957f55a677812135a026b06c1fcf7ca107690b7bfe2b4ab. 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/TCADG1778216.