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 0x0efbf27e0426068092285c1333f1118d31c0222c827e0eeeba3845e3255c0fb9. 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/ee411e8a-eaeb-41bb-95f3-8d90c2b4ac81.json and https://artists.proofprofile.net/proofs/artist/ee411e8a-eaeb-41bb-95f3-8d90c2b4ac81.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 0x8b96334243ab9378ba49536e5f9e73bc2e4004dd1e3d827df864be382e0fbdc3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USHM21965247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04584c82c13da585b2fec849960ca8178a5dd318229027d1f2f6128534f26aac. 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/USHM81940633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3454aa1837fc78e5523430bd84223963ff52798edde4fbbbd28f3fce2e1e92f2. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/USDY42190280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec268af66e52f8b11f73d47f9321b6e96cdc96008d11acf1e71ec8040565244. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USL4Q2108413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce388412677ce2779298ada2eb358d46e0d2f1f6d1b784f7465cefd561cdeea2. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/USL4R2118892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abfa20e88b6879da5f012edbc7bdc2c52b415bf35903f035e789a4c0d47e158. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR96X2249978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa754e2e8ba5b207bfdbf166d75fca4c526e52520b4ee02fd862e9311a194f702. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAGQ2299922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6946e38d7f00a3b697e0cb487bee6fff6963284697d56fd7103ed10efbb668b. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USCGH2395075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7bb9c774721632c50319615da1d7efaefa313e7d134221e8a9a8050a0fc773. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAHA2380264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5121d0751af90d854f79265517a9d1acdd7d2c9199fda44e3cdd1d1b7c043f. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/TCAHC2366819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a585a40a1cd94690866ce4f1010313aa67f401485d41ade3de926fa1837808. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/TCAIE2448447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60bcb40ea82dafa3e0229f13012b5111838d28a3fe38ab919cf9b344371b5ef. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAIE2448460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985758a1e64399ac675f8e21bdd83565798d31442d1f056b7b63e46a78f14905. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCAIE2448506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd18cdf9dd05ea25b50bef7ea7c27f3a2db12b739941e66799d82306f014693f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAIE2448518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b2a2b8a2de4d236e00c94e26638d332453becf171f79f8078cbcbe75fdf2ad. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PL44J2524129.