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 0x199654b384adfe1a89230b8125f3604ac23ba7cf443508e4a6b58691a9d4deeb. 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/21d7ae59-a929-40ea-9deb-2280be8d3859.json and https://artists.proofprofile.net/proofs/artist/21d7ae59-a929-40ea-9deb-2280be8d3859.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 0xa313a1fb181b60d8eef7a490e2998128dce1175f4e88303ebcc988153ce060af. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZMEQ2209748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a781fa139c1a264a3afa694db7c890baf590768a7e6b54351278401986721c. 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/QZK6H2367209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd30b5c790d26ab0b45a9ccd636dba65d7996b38d77051e037fc0db023038b1. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/QZFZ62404440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043cd5f88b103124dbcded6987114e57b44de43a4279162dfbf0c41103ad4638. 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/QZDA42451680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac3bf7e578c7bb87909d853c9ac94612cf6f976d3f5c140a83cc347d5824147. 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/QZES82461582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe045b96581068e5583b66b43373c678029f8d0fd108fe4db77c19d39d04257c2. 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/QZK6K2468337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf85e0688fbc84f5777a987bed20aa2032b09a7f0f6823b4a8e28105abb743f0. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZTB92407752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd544b1f73611cb9e8030845d8eb1c42142ddbb22887374f4997e0be278d6e70. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWFU2468945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a5c12f2ab91436f5ee2df0f1dfa627d50007f1280a908cd01e0d2268b45035. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZZ7N2464805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0bace73dea04be2dda459a3d21c5a6109f079864571f51a96307c56aa07ed9. 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/QZK6F2581437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223a741f84e713b2a6a70e19543b44e1ca028141e50dfea105c420084a2385d9. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZMEQ2504638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeac9dfd4bd77ae06236a1e851d4287ce0ba2a2947654e4d95e4e639ed9929ca. 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/QZMER2503403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06ffd2c5107b0de58690ae2e0a1bc1265c1444be407b35be68a9e6a15673425. 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/QZNWQ2560225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a177a2c5ecb8e3f67f2831e3e19d6917f78dadf0bfa845c48cbf2342e982f53. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZNWR2565967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ead8ce7a052c5041c5e2cc5e3d36bff1fdad641a60682b6632750d30904b895. 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/QZWFW2593086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcfc9c0a9a7767e97d9367342ac2ba07fa1f9b249df90ad9196a634724e0363. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFX2541182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ba6ff0c28dd97ae387c047e6ccf1684e6a036857954221e39e547f37044e12. 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/QZZ782503582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9e5e3a5a08def7e4480a46bba7a1a6e484c810298d6e7f031749117cfe5183. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/QT3FH2533704.