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 0x9097198174330fe85a8d861182ee48fe90f314940d2bb1bd0c1b3b3eeffe77a7. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43e118e2-5f82-4545-8cb2-defb957449f6.json and https://artists.proofprofile.net/proofs/artist/43e118e2-5f82-4545-8cb2-defb957449f6.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 0xace4ec3afabc7330977c1df757f53bfcb6be1079c8e940999163ac37181abc32. 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/HKD251016309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0198a287c0847744f3f2f3c401dd4f3a96b3e955e9acf80d8553d625ebe7ce. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HKD251400008.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4936e2145b5ef9ae567da8c2f8ba4a98341c0cf3686b8ef4412eb4d7f379eb2. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/HKD251512424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b16ad631e8d8391f886af447083c3bb838dfd070fc51d752521073d51bbcd4. 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/HKD250914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b16ad631e8d8391f886af447083c3bb838dfd070fc51d752521073d51bbcd4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKD250914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b16ad631e8d8391f886af447083c3bb838dfd070fc51d752521073d51bbcd4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKD250914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b16ad631e8d8391f886af447083c3bb838dfd070fc51d752521073d51bbcd4. 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/HKD250914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b16ad631e8d8391f886af447083c3bb838dfd070fc51d752521073d51bbcd4. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKD250914601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850df907a2e85190f03f91b133b5d3d62c6225bf6e552f3feccfb314c3ae9347. 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/HKD251119401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ed1f6e48a95b7e2f25a042317174f10fcbcfdbaa4b7f3085086a9f37b2609a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKD251119406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe3d7292a1c0cdd676791da1157a66b34382534302eb5433b75a3e0afd4157b. 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/HKD251119407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb527f3a5640a25bf59031882d5bc610ecb124700b7ff540a9eedf9786db86e4a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKD251119409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28c3637b7468bb7b735451f8e57fde20fd8c60f7cd380ae1849a4bc4503d3fd. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKD251016308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace4ec3afabc7330977c1df757f53bfcb6be1079c8e940999163ac37181abc32. 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/HKD251016309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ed1f6e48a95b7e2f25a042317174f10fcbcfdbaa4b7f3085086a9f37b2609a. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/HKD251119406.