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 0x43ef8dc973fcbb528ed89d9b70fcf48bc61ad4f46394bae7c130d91a4b3c9f07. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e11aa444-2660-4dc9-9d12-6b0a22bbdef6.json and https://artists.proofprofile.net/proofs/artist/e11aa444-2660-4dc9-9d12-6b0a22bbdef6.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 0x0a16639311b6b4b634c873e20e136ba2b24a8a8483616d65076f2ce1894de01c. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USL4Q2204114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4886730202f7001cd4374be5876c2e409441e7e57bd67e71d12e0b38263a736c. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/USL4Q2204115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f032317a476da6f529b9887a3098de4f52a657ccd70355afd8a9510938ad226. 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/USL4Q2204116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6c3e9532d8a95898a8f50d171c5e5df5306b7938724f6abb9b2e6ec26052bb. 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/USL4Q2204117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a47f960b4628bb7264dcc7ba4b64a4e634ce070669ee91b11577d3b648f92b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:10:00Z), 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/USL4Q2204120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4bbf1358fe407e5799dcc76e3158334a6da053387fca78d8233e257f9ace38f. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USL4Q2204122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974e7d153e24f97388600708052d0067c53dc955449346033865452cf96b7d36. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USL4Q2204123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d6b9775d13ce848b5661c3c1da2ee4955be2940e4cfcc75c0fb0053711f414. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USL4Q2204271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90489d1fe8971fd308ee1a13e18450c5a95bb83d3a6b5eda52e43cbf92ac9969. 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/USL4Q2204272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee8066a344070708c56fcde14c8612c72519da798181bb1d9750b8ee188839a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USL4Q2204273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf6304db388c51e98bfd41ccc7d9145844c3a05584cff46e23b6b9c159a2430. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USL4Q2204275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cfe943f8a5809d8cc8bb0e8617e4f16fb1ea2552184a32f2219d7323499b5f. 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/USDY42452772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2aca950b967bc8d73cf695c9be4531ccb4b330de57062113960c8d5b475906b. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USHM92274095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f4dfc0cc35eded9cbba18484440526717b135a895b362f27564a5d45e8af14. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USDY42452773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c3f12ae472ea9b293a0395ae4bc53b640cd846a4c8f9268eb7a50a76b8a4bf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDY42452774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ebfcb0947e30e720b334b4bac0056c2052e04d2682ec4f3f8bc0f478d0b6d9. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:53:51Z), 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/USDY42452775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef396910a9c9a4e43e9acf005b39b033039dc6d796870bc4fbdf2c48e33c796. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USL4Q2395555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd132dedd7e84f14a33ea308d113b4d249d3898ee110d7c52ebb4253712c9c9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USDY42452776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2353bdf3d05af76f4d796e4997735fe056f6cc9dd36ddcf10985dd6dfee09f61. 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/USL4Q2235572.