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 0x8b825cfb18cf1540cdf3a626481b82bb429cea53c39ff905f29fabc1a3618834. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f893d6d-ef26-4859-a26b-8c8b0922a914.json and https://artists.proofprofile.net/proofs/artist/2f893d6d-ef26-4859-a26b-8c8b0922a914.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 0x1ac1b0fbcd0d4ec3741f6757ebe6cc1678e8f9c853053f70e3b4a00cc42d09d2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZPEW2428026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7816604e47a641c2c8dbadee2bff9885d6fe74bcb5aa6a27da20698ba17880a0. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USANG2456425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dff180290f05c2ff174b4e073b4f8734a8558528e2d6d7f88aa9142bba7d096. 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/USANG2459905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9b3fc45a5080fe627b1ed76aa618d5b68f54a4addaaacc384bf4601d3662b1. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/US3DF2510210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8a76260e7c2c3c9cb5f2d4697c84cbf27573e13a073d463f46ebb7c9de2ab0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US3DF2508573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9afe0f0bc971a3d7df597b5d249e4d6c2082cbf3cee53ff98eee5a856b048e. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/US3DF2524250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbd40ebd2c6b5ad91b7d9998433059de055db132a1bf34ec683e20e54c21a13. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/US3DF2536218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c05ff5a84d130a2c12a09f22055af191ffd78eb310b6b942080343ad901b087. 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/US3DF2527287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8da25aec36563de098a2d8f8877eb1834b4d9d6fe9d71d68ee4d16499cf9921. 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/US3DF2553264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d792c3949dfb9cf475e88fdcc7d02da77ed9659adebdec0f34515517a84f5d3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US3DF2559942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497c7f58f98f7cd691800a366cd1a70557a70c0e19a5458f1ce56239ce4fb58d. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/US3DF2559945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a20b5a04ac6cbab17e684fd8905a584aab1ce08e6e79cf15f9f6f0090e80522. 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/USANG2479265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f172258629c27e6f16f814ddb562db9753914c7dc2bb653a49da055d9c217bd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZN882520496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72ec41104ce9807aa9b5e1b4daaf7a7cedec2efc18e27bb629156551c002d66. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USANG2488311.