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 0xa77391e7ce4105b0883122099b0ff28507dae47323f841143a0c17f23988103e. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c1cb30e-936d-40f9-a31e-531d90deb2b4.json and https://artists.proofprofile.net/proofs/artist/8c1cb30e-936d-40f9-a31e-531d90deb2b4.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 0xf8c5a1e2ac98e4a4024a1e3b0f460d39d462c91a124f90933ca9167cb40e1829. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMJAQ1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d268a08b5276cd8deab47b48dce47964514482ec98b6b8982a488404192dbd. 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/QMJAQ1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e57c2a5e1ee3c6dfae0152979366681f457ddc6c9c191659235ae7369597f0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMJAQ1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8226444a34a58764101a0dfa85beea403919c85a0e0b70cd00f0786b2712ba. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QMJAQ1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979db76913c7c5f132c2b3ccbdee11f92cc1a3a9d58597deedc9aaaaa139dd68. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QMJAQ1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccd6a2997f428fbb2dd71159303047affeff4fc026cd04cfa918561cbc9415c. 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/QMJAQ1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe360d8306aa8d106754d20f0d6dd8bef99ccf774040333176acba404b0352b3. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QMJAQ1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1755ff57bd43334979896c19e28dfc1c28b11d99f508fa4b31754454b1b72d4. 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/QMJAQ1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa86963dec2834d2fb8f9db0adc40280f2b78eff9d672b074224e564e631587. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QMJAQ1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeff17357872e1e3bb868a77c161574694667067d1e1f97b315c4ab6584fe56c. 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/USHM21671016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50388d4b2a97f4cbf2b76206c5ca95505f33b435cee74038d072f78eddc3297. 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/USHM21671022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a7d4867a3e9d6847dd151c305f856eca6f166eb735dd8ff1243a74c6dbc2a6. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USHM21671023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22accbd242096e2c3f017a5f67deb7862d2c5343016d7cf4e6e3f6cdd7b8e8be. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM21671024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d13ea547a168f514c7190095089f5f9f47db34a5504383df2b62aa78252633. 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/USHM21671027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc300ccdcf65d5b24c352a83b09b9f4c6e45f829cfe782a808978cd5891e0a959. 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/USHM21671029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05d60266a0fdb58eced30b8f2f6e4f6b57d14d30ed75259c98e37b160bf6c7a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USHM21671032.