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 0x04fca001219186c1feaa761539ce2a675a88b7ca485c05e7bcfbacaf602a3ccc. 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/cd86d65c-9fe7-407e-91ba-eafd3cecc471.json and https://artists.proofprofile.net/proofs/artist/cd86d65c-9fe7-407e-91ba-eafd3cecc471.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 0x84c21049f291274a0c34106a3c31652261b537f4a924a9bb81656e7b70b04032. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GBSMU3799226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8869bec3bb9dc3fcb9165fdb887b89804064855c031c9e04aae3cb9450f304c. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:06:34Z), 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/PLV401700280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf835fe4c71884aac74005f9e87a4f1d6a31e35b9ae8d302c223b52e2639ed10. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PLV401700282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1f018f95bd9adffb8866e12503f4ca6395d8ff6a0c51aa1ab3cca9de31ffd4. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/PLV401700284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc572d98941b07d0c0cbfafebf5b501088fba5aa4ec5e920f2cd2aad8ca4e832f. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/PLV401700267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a1a29c6feb84e08028037a53f7fe154c8494c81620a43e7b31e763ffcd164f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLV401900510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3085cad2d8b5627a6b8a3a5c6764cc143b263e99e13fa83eb4448ad2d0b9ab65. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLV402000652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3839465e50365fb8e9949803fcb075af85cb3d84cb44421b9cbe95c27687fbf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLV402000947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dd02d002dfa96507a465a98d566502285d947341a5503a6f47e06e7b4a0302. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLV402000977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e421b8192ce16cf1f1e1a71368007c05af3347b1ccb5084120c575526acecc0. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:00:52Z), 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/PLC062223726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc936e2c322b35d7120c94b7d8f1e46e5a6563464677dfc9e4cd6ec5bc88bc596. 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/PLI292200580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8dd59db919ba369096b2ce2638507dce9ef66d63c3b5d2a896c159e9d91ebe. 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/PLA681601934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec4f49e35271949d4cf78d9fc9f9481905b2da8a4df2ec9b065ec92ea26c856. 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/PLC061907618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5597ea3637eeb0736e4415829a9267f01002ffe83d51b3a97770578ff466a5. 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/PLUM72100430.