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 0x5f938b845da2fe334d535baf618140d44f60f1d87d5e80deb55f10ef942f3002. 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/c88ad784-d6f7-4450-9a78-2ebdee5ae207.json and https://artists.proofprofile.net/proofs/artist/c88ad784-d6f7-4450-9a78-2ebdee5ae207.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 0x76ea8770bc36e4be8d9ed35913767219f969d653e3410c6d655680b64aa96455. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/CA5KR2095527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a05e97f335226af2f59bfcc87ddf83d979e598b4ba11a9488657c9dafc5cb3e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CA5KR2256328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf678f4f626e0237ecfcd3b90faf3ada6ffc9f2ac7993e29e835742f85556503c. 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/CA5KR2270129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdac2199e60069508df9bffe4f1e0700c8f66a2a4864c45037f9b038545f8493. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/AUDCB1702280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb25e93c2d67be23c050b6e1be67d797d0c4f328b9bd6e403ba393820048a850. 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/AUDCB1702305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039bac9ef9ae9411eff51774e70b360c20b77fd74d63faf5e041fa1af320366f. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/CA5KR2373403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efb303d46b04568d0a86d8d7406363498424b207d54760fbe16bb4b01a27c38. 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/AUDCB1702442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fd4f4605bedb64605d71fea01454c2014aa7b97de36129aa3722590858e66f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBLV62321480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a486e5f6156d5949de35a9ebdc5fa1338b967b2f061f1a0f1c355ddc5ede9d. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/GBLV62321482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf5f4f9f5fc22d6bdcbed6a75a8508381b1c51b8c6fd03ecf64832b76049a0c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USCGJ2569778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62163bdc7d2cef3e5e1424494c33bf424ed20d053211892f47becc27b2764ea6. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBKQU2183531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498d374ace9beab0399225f6f7c4f9f49c09d22d2bf40243492bd63a46117cc4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBLV62005104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52524fd5fc7bee9ed26b971a4f771fcce0f22a1cc4623960d9bedb1837ebd8da. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CA5KR2017258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54bedb68061312028c3edc6eb5e1093899b964cad7e39c818fe25612bd05cde. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USYBL2101638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6ed40aa49ba91e2255b24e3dabdf4e17fcdb1214075e4c3b8f868730d219c6. 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/CA5KR1974831.