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 0x9c04dce615a2260fff21d65baf300595ce36c6f2183a00e39884dc32852b0f01. 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/b97de3d2-493b-4b8c-b0b0-47145fb9ceaf.json and https://artists.proofprofile.net/proofs/artist/b97de3d2-493b-4b8c-b0b0-47145fb9ceaf.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 0x9469956c981da39ccbf4e742d6d957833b06472b84f414493e8574756968abcd. 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/NLE871253801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1bb437bb2c1d28acd58a220b57802a6b14b5dd360b3bd2678c3596439cbb46. 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/NLE871318502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba070cddf78fbd07312be34e026db020a7cbaa9cb186f426618e26f6741c9ef3. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/NLE871266001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e1494a24e56846e4f178ace8d6e8db66d693fc3b9baad421c0dc97b1dd550a. 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/NLE871314802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e864ee0ec2a96af6f0f96810a958a8c4d4139609357e8a5fe817d6f2975cb96. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/NLE871314801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173ae7ab3ac02e1132d90b9037f97a7e5895e395915e23e770f568815723ea49. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/NLE871544601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d6dceb828ec8faf78bd86b445558465842eb163d7a058e7760d6b4abd99595. 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/NLE871710901.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652c082d024dca30eb7cc1f846fb0de4d16f3215694c2d9ec392097b8b0df987. 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/NLE871745101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe60cc9681dfac3f18385ed69e99b99bbf9eadd75acc6af1ebd6bbd4c8fdda7. 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/NLE871915200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91991f85c2aa4cb4ff4a005335f25914b3aa5b02081cc90854a2d881c2771896. 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/NLE871924000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7087a270b782764a9e47b76e1d6e12d27108f237e8e5bcf3457595107265adcb. 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/NLE871934700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0419d31204bd02bd656b3f22518b0e9fc45d100b56420a4aef0775939504a7. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/NLE872203301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17d85c8155898025bd3c9f509ef4e1ed00006b800ff989b985cd7de74a32a10. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NLE872213301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270d3057109a17d24b918a21b2b5ede2f06e7555b178916c71aa209b94678fe0. 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/NLE872219501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83a9eb0c35790a2622fe18320e91ffb1c4ac9999a39b1c32f6c1f3201f3c878. 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/NLE872310301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce14700b3ffbf70586cd1416953f47947e38d5bbbb6cd8da4c572d9a877bb1dd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLE871939400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377324664b5406eacdfe1e5f4d6a60666fbd7ed455b608baf2812a6aaf275c82. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLE871266002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb103f2a0a6548eccc11636d01d44086b1c632c365a90b35b8f7bd4d86bcd3dc9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLE872170101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83a9eb0c35790a2622fe18320e91ffb1c4ac9999a39b1c32f6c1f3201f3c878. 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/NLE872310301.