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 0x36c889181dadfc37b351fe6a897356b7aaefb6ad4fccfc5d3428e4e6d71c31d0. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1fe19fd2-9bf0-4bc2-9026-8e74698a76e7.json and https://artists.proofprofile.net/proofs/artist/1fe19fd2-9bf0-4bc2-9026-8e74698a76e7.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 0xe4ef9b16f745eb3b6711bc33860755ae70536cf90a31a545cba832c128ce09ec. 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/HKI432400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d64eec9406783488cb5eab3cdf251b22649832e8374c1e1e07ffdf5b7b55c08. 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/GBMJG2411612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcce127a8dc9b4a49634212cd06afbbc30b9c3a1767a3c8b4e7c9ce6b4c70015. 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/GBMJG2405523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96748150ca5784b0d94b4d18cf4e929caccbf69f1ebb36efdd0ff9b266641a7e. 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/GBMJG2329898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4849d0f090b891e5027fad7041106ff8b2e884fc788a119f8b60526701ed6aab. 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/GBMJG2315818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa59c4cdc25fecd0b4e647501e33466e6ca1625dfbfd53aee9a344d22524d8c1. 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/GBMJG2232057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ed044867ecb4092d67aaa545f0fb0b4cbbba0e882d779c993fe77125f1e26b. 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/HKE912200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafac999329e59d7bddb767d8dadab1ffa424c2b0111714b423fe6d52c4ef90d. 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/HKE912100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c01dc39ec3a3caf637385e4297676493befe8229810d24c267a1f51d1e03b3. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKE912100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcce127a8dc9b4a49634212cd06afbbc30b9c3a1767a3c8b4e7c9ce6b4c70015. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBMJG2405523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ef9b16f745eb3b6711bc33860755ae70536cf90a31a545cba832c128ce09ec. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/HKI432400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf579b0a1ddcda79ab973f2c095384d189968f039e895a41f662b29400cdcc20a. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/HKI432400094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1ea79ba47fdbddef02fdc84e079cad7ddcb6da5a2046651493d253386c26ac. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/HKI432400095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771491bd35720a7c448b825748d7d958a67698e7dfe5e67fbb3bf58c753f41e6. 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/HKI432400096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d8fd78d6349d8ef24106db679618d35c4f1d937a32016df3f22b557f27e123. 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/HKI432400097.