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 0x80232009108ba0673ae7bb435b8570aa0865475adfba53aa0e2e3bdb53706e7d. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e3a2f20-9503-45fb-b62d-01a09150b23c.json and https://artists.proofprofile.net/proofs/artist/9e3a2f20-9503-45fb-b62d-01a09150b23c.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 0xe5a71c8bb75c6da8b3a34eb9a957b94ee4432ff02ab12aeddc4ef3a796a04f6a. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USACX0611147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597c7f2702626523ea366af256534d8afa8e8022df4a19bb519011744af5c310. 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/USDNB0853001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68082772bcfe6ff8afb1e7dab151c649eb990d2ffecb524a1973e8799a465fd. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USDNB0853002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e8ee151f4959d0446b577f86df415ddd7ee447ce81b9ba36b7b39f11fdd786. 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/USDNB0853003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7284dfd733bfa02539232a2d4bb0a184f551af6da9eab49f88e12358a3b6ff57. 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/USDNB0853004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df9437de0f88ef67c816682ddee1a9c0e3bc8c70a7771aee2cb459523f95fc8. 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/USDNB0853005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9190b374fc705d01c5b67b6992702ea56360d5b541ffb8a818820521871ad714. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USDNB0853006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd495246fa53d4b2c39d5ddbe230e55516a710c5478deaf9a446fe2149377a5. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USDNB0853007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e11eff0309414a527378afce87e6679d20929f7a1eed0855df1fdd1200b8d8e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USDNB0853008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd078af12054bd9bfff6e50b6300c279eb4d7d03b197e6fe19701e4c329656c. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USDNB0853009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1691e79d0cfab7b901f0dcd80a1bff121b6fa8724784cccce87032a2306fdd65. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USDNB0853010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b96ca078a7071fd97bcb65fa8fb0f516f6587bc31acd598e5f3d816e19d2a6f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USDNB0853011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ae667e6513128fdae9ae1245ce81e604c099807bcf46313f326b7753fc3f60. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USDNB0853012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7805c128d3ae8abbda80117ded4cf429c8da5286c47bccc1e1755eaaa16639d6. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USDNB0853013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295deca7786eb6e61c8c6668b570a6e5ce00b56eb49c699c925ca96dbfd285e7. 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/USDNB0853014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de1513d27dac77dbbe80fe5f460bb670a3f52fe259d3e147c7554eb2532453c. 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/USDNB0853015.