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 0x8fcb0c96b3dd2448687e15a911f4872e0ff72dfa31f21f1c657758eea43ec238. 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/c00af4a7-f258-4d10-a099-623c70f9f47e.json and https://artists.proofprofile.net/proofs/artist/c00af4a7-f258-4d10-a099-623c70f9f47e.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 0x15fc1cb57247c2e49f3514173bdb69f1d6c23c0c79608cc682e97785de11b4d1. 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/QMPKX1757868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0a3a48b06ced2c57c4a8fa0fbff3d16181bdfcba9043a33992c4a0c4d95a99. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZCE61869645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b671e81a776ca2f8533f82fd815befa1f15c847444ad1ba2b1a40f8b795d85f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US83Z2019112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e69c5b827b4e8c590a09cb7b1e830e82531509f42be37f7de8bdd341de8151f. 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/US83Z2019113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9438d596a29ec5650a8b67c7c97ef4b5e82807dd94e52fb69b3d4e2db4a5fb15. 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/QZHN92232059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c2e3b2b44c131474ae48c6bfbe6ab90e5063fd58f4d1e8fbcaf0dcb4927f1b. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:07:07Z), 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/QZRP42269340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2e48b1ffa5ccaecb65b5fddcc74ce7a1d129a52e26022c9f3f21ca328fe9f3. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:03:15Z), 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/QZRP42269341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30c59ebc73aba85b7163b8b1f05343765c145e1b09c93eacbf46f9279ed4aad. 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/QZRP42269342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430ceb57cc272d962cdb335cb10fe70c8fa914ab86005e21d75655f0d6433353. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZZ7T2496831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efb0565b366727c960a23d5ec8016d2fa4800f6b60ef1fa125f2c9b92ff433b. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZZ7T2496833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6d10568cc8aa2f2fa9d5e6c340d32b5d3ec446e0f0ff904d6b8bb43f133129. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZK6N2591518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c4880707483c11cd5110311cdfa9bffff94d9e45b09fb5be458a236cafc06b. 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/QZK6N2591519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2cd5a39e36cac7f29fc8ae269e8fe453545b79596bd12ec66d99ba9a73cdbd. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6N2591520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d883e2489aa9fe00b60325da258bb0f1f5781da0b3f2f8da2edf38dd85b22b. 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/QZK6N2591521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc313f8cb9b15b08aad91c5d93cda0e7f1f5f1e08fbf5b1c95fff07eb434044a. 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/SEYOK1517732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa2e59e160ff184db0f7b640d6e616d086d16ac953213c9afbfd3640625a704. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCADI1770153.