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 0xf730d60845037a5a7ff14e66a1baf89e2cb0e91d4a12f435e6a0acfb6a093d29. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1c72a85-381c-4af6-919f-bf88f66ebb3d.json and https://artists.proofprofile.net/proofs/artist/f1c72a85-381c-4af6-919f-bf88f66ebb3d.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 0xd4adc2e87cf85047ad0f22cf02cd2915d486369f3fa0c70f3ced5fb8bef77b11. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/IT0J22100294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841c3614a436f1f90d1f95d345eab5637b90d0f40791e1774d8d65d4aa4e6807. 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/GBKPL1979539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70fe95196c9307eb22219a690589759c536cee41b656bb22a7295ec70e5be95. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMBZ92380934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f850e12bd29819509569abb434304ca31b1e45c041a195f5ec76dcfdd865e82. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZQAY2249976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cb4d86ff77d840b9a01984772bfa66b70e22d2289f0c884e6a655ed00beab9. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/GBKQU2218265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf83a9d8b06c04e4df9abe8ddb74518ff135693b974079c8e8d3f72467bb48f2. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/GBKQU2216277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa614f32ef9f7f6f56aa41db5bcb01f20ec84e8343397132eeb14625642f44981. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBKQU2208533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca01c8c32813d45c73fea2b28f57ddf19b1bdfb47a0d3431fc5deea82f55cd6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZPEW2000434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b870a2d3460ccae31b9ebadc3358d41f835a1a95c70155066ff580e0fb44ec6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEW871510809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ebe481c64a6557f031d2fcc9f1b05003d6952b983dd22d393999ab4cbe91b6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ITAR51310013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7cde2001eee2c7f8dfd11aaa8b70f0462c0d43ddc5697d336503cc40ffc2618. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEW871703394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93cdd6c13b21158e1bc22eca4745545e00f10b23502841dbd9bfca8ba6dd5bb. 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/GBKPL1976761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373ded7a9876195d21b8f79ee68137d4784c6e41b3c643e826cf5b40b0bfc310. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBKPL2096179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99f4cf3b82c6ef36a44aa11a46084960727572a72d4a251f17a14718dc76d17. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBKPL2095206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda820a39df71b9f1f506f1af84d5082eeef9406a5ff280dce3890616fd8c6537. 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/GBKPL2033547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b94430321bab5a3d7bd6b436bf0d8fe6434ad56997dbd20801fa03a84a914ed. 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/GBKPL2090711.