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 0xa837f04d725a8dd981711bbac2ed8b8c3fbf3b7e9fd542e1b10debd9cef5824a. 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/2652462b-0566-4520-8cb6-e8b2d05aef63.json and https://artists.proofprofile.net/proofs/artist/2652462b-0566-4520-8cb6-e8b2d05aef63.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 0xa30547a282e876006674752b9dfa325c80913e10f52fb9efa6633de22ef8d89b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GBKQU1581398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e11529050f9f46607a9617dc40eee0c36df41ac519e12cb7f0a0fc5895516b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CA5KR1565458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc730a7b0c2a9528ac59bfe419a2017e1bc8229bed85cba05b355edc841f19c5. 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/CA5KR1565460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba92829e4dafa8d4a068143a0c282e1b721c4cf5cf3c856e7449f5312f481786. 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/CA5KR1916635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423abd5f803099b518e4f97c05612ae3d74790def5aae9b27ae0122db67a4ff1. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:10:37Z), 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/CA5KR2020591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a83f79476fc9c3b4735ca9a31dec402eb372effcaee2064666a678e58bc1c1f. 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/CA5KR2085239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b73ed166c8ffeae0f2871fea576f8af0056ca1bafed3b9c733b859827ab8f1. 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/CAGOO2112999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92464f90d69386f3bf94445a1f4ae62d2439583d1a2c08d633873fac67add54. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:34:54Z), 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/CAGOO2188419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3655c0317a8539d86d88b1e4535744921f2985de6088125f56bb718b13e14d8b. 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/CACWV2271284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba429a706b4bb8113e2aae1afc6647da758b7f7d1956648dc12724d086d8be23. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAHQJ2295560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead8cc54c4ee89e81bc8953ec15475a3d2938bbc7febaa1558602551ecc7b5b3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CA5KR2370362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b616a441b62597adf197323b36da8ec263377aa320fb517eaa0d002a89f957. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CA5KR2415545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39630178f592a647a61897791b5e2348cb20f2bb76c59fc49045667b93e780d3. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/DEGA22404201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b46a03af65e44565a98201cea01558bded2f591201ef8c5e7c1bd73cdd8bcb. 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/DEKC42300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2802d14225ab9fe6c2741279bfea008ced7e9a4b77bff3642561de5536e3c855. 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/DEGA22303849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5289222f3daadfa9c5ead492b03fa014205ab57c31401b95a4baee37f14928b1. 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/CA5KR2116993.