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 0xd868d59c90081259b26b3bd6dfbb9f1c251900b93250db1b1667ce9946749c58. 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/b91edbe1-0eab-4c7e-9552-47e97cf9c7ce.json and https://artists.proofprofile.net/proofs/artist/b91edbe1-0eab-4c7e-9552-47e97cf9c7ce.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 0x8d1d3c7745a5c34900ec1c44886d22953e311f29fd11370ebf58fd2d8fac0f91. 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/HKUM71300414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5c45d17cb69c1f4ed1cdd2c8a4bee4f185b3aad860ef6f1147c25750865c66. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HKUM71300302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3318768ffdd3f39e787a405446c74b167e89cb6a75a1820dffbb3724df8498. 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/HKUM71300415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe7ca0d437692a77c69737e62b400fbe24407b0d51a73238665f505921a7c39. 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/HKUM71300416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0f0889150ad2439e3d09ccf505ea4ea014b5e996f05a773cf69a42cb41f5a1. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKUM71300417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b118de862e7903ecebc20764918f3b9a9d15763f32d3489f70a38d26358225. 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/HKUM71300419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bcbc148d5d2e3c774c2932d616f562dff1f86db2384343e226e3fa779f1fa6c. 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/HKUM71300301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2905b25f09a0a480da6547a53a261f16979c15b94b4441b723c1feed8c3c0a0a. 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/HKUM70600411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e11efe9d1356acaf6cc722cae5ad5c4910aef1e0123957b00a8ddb570b9f8d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKUM70700895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94685f6f7c20926623871971c6194793f4f841fa124bd3018ef076335b0c2be2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/HKUM70600423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1c90f094291b6819280dafaa9ecdb7dfbda41f071eb33b797527d4023a1e93. 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/HKUM70600412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68af4f3a11dc8cc675d72fd4f31168c679e9323686ed602f3194140a63d545f1. 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/HKG732117866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d7901dc0d96a4818c1812d7b1f0463f8293dd5cd7dc55d8e4857c13a068178. 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/HKUM70600420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190d8aca79064c27d9080987324564db0cde40e1d89fd8e191cd7769bc943eae. 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/HKUM70900207.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd1882d56308f915d30e8146448fe5c4ee5fe3705def6a7a5f239dbfccf4acc. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/HKUM70600397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3318768ffdd3f39e787a405446c74b167e89cb6a75a1820dffbb3724df8498. 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/HKUM71300415.