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 0xef63af9c3c0c97f0812203c64ffe8d2eb219af47884e793b21b582fb39bcdbcc. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6d8c03a-1801-40cf-80b1-72aad54f42ea.json and https://artists.proofprofile.net/proofs/artist/f6d8c03a-1801-40cf-80b1-72aad54f42ea.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 0xf13d04dd3df5af9e4773d09cab489e860b9e79fbd917d60c44655a7ea8a2ef68. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZNJV2371693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe935b30bb957646f446f6d1373e36b308e7dc107ca32de3e0727133faed9e348. 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/US7VG2479944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90526c98ad1971bd1e3fac94075d39bc964e608a3691ad075b32b7ffbebec1a. 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/QZ5AB2417942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d48758742c59d576a2c1ff5b52234311cec29dc0e6d933781cd1d069d2482e3. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZGLM2409446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5d865ff15ac3c19e7679d566f61b9299f11f806503fefe26f466bed6be6550. 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/QZGLM2409448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5b5252d386918992ee58572f179b258dddcc003704e110377e6779b2ba2d05. 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/QZ5AB2462690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c03ee5427178fcf80919c8bf3fc1f638bf8129b7ee029f25cb361c57b248801. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZ5AB2476980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a03f973f4613561fe510ebf2bfa76692ad386f147235c893bcd1ecb4b0cb859. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZ5AB2476981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28fce8cb8854771c3e8fbbd62a1e2bb2aeb2be9c3174da31a4c8f1133d195b57. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZ5AB2476979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9fc177721b9148f54e577c0db864b62de34c5706b8f6c76bbcde35c2f138b5. 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/QZGLM2409615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138635f0f0dca58dc7fad1752dc9c73f4b1fcc3ff12ece1f59471af709397925. 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/QZGLM2409610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b4e6181388b686bad9fe998fc6094cda237265f0ea99995a0daeccc7dc1eac. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZGLM2409611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627b86bbbe3986235d3ea065e4f863b62e3e8d6982d4b9eca40930291ad28912. 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/QZ5AB2491651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f55ddfb05c18b22be6243f61a4d921307c9583e68e508cdba5a6f408405efdc. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZGLM2429633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c29e0ef9d74b73fbd4558646920d7b4ac4f50a1e68bb1a57df519e2c36c676. 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/QZGLM2429637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06907ebacfd743caa3af6a40e56cd2e8e17991a216a09ae446a5b725b152a9ed. 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/QZGLM2429635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8293f0d19831a72b6e1a4712dd6e77b2a538015d4904f97f040ed332a1c7fb. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZNJY2441968.