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 0x08d316591898acb743021454377f3dcafe818da2db6ae86e1938316aa5742723. 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/9558fb2d-478d-473c-a0b4-ecc34327b3d5.json and https://artists.proofprofile.net/proofs/artist/9558fb2d-478d-473c-a0b4-ecc34327b3d5.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 0xb9a954de301decc32ba02af365f57d2936edb788afcfb4db443d1a52e2c5dceb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTBF2320965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f2ecf1237e386139681080dce4939960cdf79938eb2e9459610e6f37899ff0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZFYZ2457543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c079908f16a7870e3bccd4fa8483e1f0841e3e26f9c6e49ac395b4b864b086f. 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/QZHNC2457095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352897f6e8efcf82bd9aae953c4b4ea42680de62ac1e9d3d89e309a42f667100. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZMEM2405921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ab0ab8adaef8b514ff43f2d7033acc342bfa0405c7f8cfdbd4a1c77175ad06. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ATR981321856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539d8f293d693a499a117b5e7dce3eee4884ee8ce602182818d6280eda00c7e3. 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/HUA612403691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab05b55b8fa133087db41b45797a8a92ad22fa1c3b68e0c76c8085f9faf7680. 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/HUBNX2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf97d32edf3d88b55a024ed67984097ba89a545f2efd3f9aca2f0b1b05204fa. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/HUBNX2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72beb1b2d6887a82c38436040630db9cf6da7c70673543428f8713f34d00a97. 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/HUBNX2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8d1a49a298bb825df9d20652f09c6770c8d4f697b9e646c08b346261760d59. 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/HUBNX2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cebb2ac07a4dfecb4bce73563d13d67f2f7a0d292f763a7072c18d137eaea0. 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/HUBNX2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c00ecd459537aea19e59a25d8b1f73878f25de1e5f07484f639fce2e7924d76. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/HUBNX2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2d91d33dac5b9378c99401510399ff80d8b5762b4d4bca25af39f49cd76ed2. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/HUBNX2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe362dbd05eda2a61df4be1fb06d09d07e78d48401fa561b06ea8a95768d10d6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/HUBNX2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc011c7cff7000179066909de8aa618fe03bade5d2fb5732f828fa70dae47aeb. 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/HUA612501171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd0580c5a8efb9b47269f45003c7d2073ad457161145384eacc41cdd9b1e936. 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/ATR981322481.