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 0x41dc2fc8c6db83ca911f0851546968579bb16db2bf3ceebc7ac695f52cee8b6a. 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/b071ddd1-8d72-4fc4-b848-d76b205ffe75.json and https://artists.proofprofile.net/proofs/artist/b071ddd1-8d72-4fc4-b848-d76b205ffe75.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 0x2c7472835fc8eaa30822df406ef34213ccc0908fc71c5cf347261a130da7a35c. 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/FR59R2499755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271a19078fabfc0508749d8a9ae8beaa8dfd74ed67e6bbd158092c9eda160764. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FR59R2499756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974da67faefae3f72f97df698201a6f25b3939a2bc4b3ffed20121c383edd6ff. 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/FR59R2499757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47da96a66d2577b0d15d2f07e866db495503cf990af27cd3700df0826c531369. 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/FR59R2499758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8639de64b8ae59e2024a0a50ad3be48bc357fcadb8185412326a7f0b6af0dadb. 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/FR59R2499759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25fc7fa1b48f224ec352fe7f6a4209f6e291c784010b8596191174dddb5ccce. 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/FR59R2499760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705d69864ad3478134e412f8d7549d5dc29d3cb666c133730c71c7249e9f5d3d. 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/FR59R2499761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3df2f2f476013d0d2eeb7d19341b63da7d4adf0565f81d1719c518654e368b. 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/FR59R2499762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260c97b3eeff09c47dd6c3944de6eb96f011a9cd225379f58d22db0954a3d9ea. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR59R2499763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd1af6eee977d97462c6bee267928c04128d2e30607e5165d9d1b6a6dce599b. 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/FR59R2499764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25fc7fa1b48f224ec352fe7f6a4209f6e291c784010b8596191174dddb5ccce. 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/FR59R2499760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a95d273f95a07090d0641ea40d7bffee503bfee8fdf3f1244ed8f11e69e6a2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/AUUM71801028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acfa1048b5f0cfe631a29da952a113b8bc116b215851c00230f63a53f382b56. 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/AUUM71801030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee19dc12654651db693eea621fd96aaa50c8d75eb52208f82ccfcaebcd0fb37. 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/AUUM71801031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa7f2a16ef6dfb8dbe031ffad34c5f76eee325c8875ffcf2c2394227f4e291f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/AUUM71801032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cb3c99beb7ba64bbba389373f49d6812a39cd6a773e6a4c9d3da0eb73e3c8c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/AUUM71801029.