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 0xca7004ed3925c497ecd112ba87cead79b20f295f46d5762ca31eac0badf6ed22. 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/f2cf20cc-67a5-457f-9cc3-5d1b665dadef.json and https://artists.proofprofile.net/proofs/artist/f2cf20cc-67a5-457f-9cc3-5d1b665dadef.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 0x921870f328913401e5d55bc89e92aebecfdf7bc5f053fbd29bc419f068032bed. 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/CAH682100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b77d33de03c4bc61348aa64e225eed2f468f0702ada6ba7964c01b588f266f. 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/DGA0H2415979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf858c7e562e1eaac587cd6748c9c8dd4e5de88ac3b75b463cebef49a4c072430. 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/CAH682100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f7be9c0e0284c61e9291d48899594e0153acfb3f4d1df01a78aacda9f96fc9. 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/CAH682100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d515ad6be89d95cfdec079c747fa267cf114e6aad7c0debcc9507acfdcc704. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CAH682100047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95f3daebc07dfafec878e0f7a0cb9f746ded4db21ef31a44245a2e5cc0adb0b. 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/CAH682100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb4ada50979018472d43917f961c3c28ba8ab3111f256aa901b56229286e1c7. 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/CAH682100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9c1588673ff088a1e57927eb05fcbdf947d9a84a02d64af85d5d5947ae88b3. 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/CAH682100042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0a0a2ab3d31aa71eec517704848ac51440cc0146bccb5f70d47be0eb3e123c. 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/CAH682100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3734f79a422b0b9a1b3f4d6e02d184192b8e811de294b6869ebecf9c609b05e. 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/CAH682100075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f70ccd191bea163ad7b3f31ec493b3dc00b16c6af66ea24ab32f235623edeb1. 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/CAH682100076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd789837871caf964758be39adce02b4e6d19929102e64495b5d28de495ad0ceb. 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/CAH682100077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921870f328913401e5d55bc89e92aebecfdf7bc5f053fbd29bc419f068032bed. 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/CAH682100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800ec2b82cccc45b6b7ae8b3287ff005518723dac7b106a99fe0ac89f72e1bdf. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/CAH682100079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f7be9c0e0284c61e9291d48899594e0153acfb3f4d1df01a78aacda9f96fc9. 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/CAH682100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d515ad6be89d95cfdec079c747fa267cf114e6aad7c0debcc9507acfdcc704. 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/CAH682100047.