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 0xd6990a56a6f0f3d6c4d60aedc842a188fecc334e14a4fdae483bbdc05221040c. 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/552ef387-593c-4339-bc4f-3c0d4f94d589.json and https://artists.proofprofile.net/proofs/artist/552ef387-593c-4339-bc4f-3c0d4f94d589.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 0xeb19584a82cc4f514876ba55951f8640510d1d499883f59b82efb597c9a94462. 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/BK4442300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27cfd08cfe5bfad6638f8bdbc0758bdc3ec2920e2684f9334f87d6c458a30a0. 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/BK4442400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff15488e23ad4cc5dc247951a17cc13f3436e0168d0eeebdada438245c4690ee. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/BK4442400437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c99ac3fc12c44f4944eb68468c79a5650236061e4cfcf5806005be037be5b1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BK4442400163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775c6a0020133253e3f2f63ce126d57d369973da9691fef6a9d8b725843c5f4c. 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/QZ5AB2313051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b17e33e3ed7ed782ba5a57d6ebc812b482097a0e417ee06b65dba4b9e11cb85. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/BXJK02200141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22a5936d2a1c77b63e489d959da140d4448c24784f5638c4cea6602597b85bb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXG6R2400264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2a019c174716394f94dec1cc23e0f15790ec94ea12ab7feccb6ca6f5e0a023. 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/BXG6R2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bc68d6f54d8d7127220ac0f7ad1f54696e6955602516119529032e5c3651ba. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BK4442400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09b899bed1cb2e1289d372ffa0f22982381ce02b362a49a68649eaf8b4a6fe5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXG6R2400973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1455780314ec82e6d0f321617f96c2e0b1f31821a3f2a1c41a9d0bd5b8c1e5e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXG6R2301047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2a019c174716394f94dec1cc23e0f15790ec94ea12ab7feccb6ca6f5e0a023. 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/BXG6R2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8908ac75a08f85ae6aec2f2d9b144f416346c29c4100af3d3d616e37a8db03c. 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/BK4442400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a31543074b89f9a831539f4114b036d9dc3f3e7824b97c0d8b9a314eb74077d. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/GBLFP2591427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac4c589257490812daa5ac12a77742babe3b9b35e6b095a7008d22d0cffb5f1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BK4442500134.