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 0x4d16689ce4d487beb5060107019fd892488decafc3d4fcc8d5b62ae5962d7a1a. 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/fc690f9b-5545-4004-8ff6-4a9cb8be7a46.json and https://artists.proofprofile.net/proofs/artist/fc690f9b-5545-4004-8ff6-4a9cb8be7a46.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 0x6d36079c2f10dc512fffe34a335e374c826a6dfd4c3fcb451cf3288948214322. 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/FR26V1605229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978a1ea05bd6af4e1b513b44fb19d26f9e5a240e04b47a001252e9c3b243215d. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/FR26V1605230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538e6c816b4cd18ef05284ca077075da0d6f068440e19f4b50c004fc887c142c. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCADG1772637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e881dc586d6dac6cf08c120c5798a49126172f3983539e0145cc84dec89ba62. 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/TCADG1772638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefa4e1f3b6356d470cbf0f23303d62fec01f48a751e2d8b0943b645e75cec9d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCADG1773765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa9dd933d5c47a24d98bf4bd76f64d887faeb313a53dbfc174a9539ea1b7d4a. 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/TCADG1773766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01af48b0acf03031a109344f19ca1756b047c67487ee9b7236a0f6aa46c4394. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCADG1773771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03f15b06b7e28deea273b60496339190221bd68d4507f95cd34d45f603747d7. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/FRX851901631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a65a2afed80cafa5e9e621af23193b9e2946ceb507fded817d04fa7922f8ccb. 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/FRX851901640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda717776affe604db2855f33c133812e00d253e1e8893bdfc08ba05a4e1b0559. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR9W12354372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6741b34f4900b3f522362c5edad6f5157afb6fb70df4044f7dc40a7f23a7a18. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FR9W12355885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4be81d85c5c02eb0489a01aed9ad185afbd885e79d3f0e503822738914a097. 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/FR9W12355886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258c86c2d521d798c8d58cbccac603baf64dc20bcea51b9992cdd0f2bd4f0a3c. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/FR9W12409551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780ee9219d5cf2d4ab33ebed2918254e613dd8bbd6aeea34eddddaac83999da3. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/FR9W12415740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939ef7004d058b3960fbd8d095a76fbc9657a84cb6c6c35c6397cf9eb716f0fb. 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/FR9W12418703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2f3574781f0e0ab20a7f308aa3f7a1ae08adb2608afb5a0d12efc5d8eb7c6d. 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/FR9W12430434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cffce13b9066bed6352054f69be06454793ef6cd3b0ea09de2ea1d58a12fb0. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/FR9W12137479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ef4723de39812513717498bb4afb037289fabe26eecd9e28e572567fe83757. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR9W11720738.