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 0x89f9918a20fa9b7650627a0c43e852d52b00f840ff8e500c1f42404d8bdb840e. 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/2b122bf4-f72c-4a80-a86e-d6b502e8bc4b.json and https://artists.proofprofile.net/proofs/artist/2b122bf4-f72c-4a80-a86e-d6b502e8bc4b.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 0x670556d25eabd20365e746aa2cf30eb0f5f46e38ae90f2046db341e951ba0b2b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/VNA0M1915807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22645fc33c39ab2946250d3557bdb8abd6a26ab34fd36e6e49741f65d7fe4ed6. 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/VNA0M1927723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b30a1921b116a8c2e91ac458257cbc339e5d56e1935de9f7ec3fa6620cac7a5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/VNA0M1927724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a999068cf940d1022e8224ce58a73f62266e45ea4e9521a625456736543e20b. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/VNA0M1928093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817f583d24febc5f2fb60a8fda51ba79a7f680d0521ce5c470330feb61578359. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/DGA082298604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174d522f36e4b2fd22540dd9aeaeb55335397d983144ca69731d3fe90e1fba07. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/VNA0M1930954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0523c8848eb2a7de369b728ad837c41eb0030608dddada16ea42cc72b50b524b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/VNA0M1933065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81da6d6f21a05a6adfec803a7b9715ba0c3305afd65c04fd62e31704b911ef7c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/VNA0M1933066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d35a093032a8bbfa774e13dccee7f5e45d80b4c67af76ff3ed4d5543ce1399a. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/VNA0M1933068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcfbe3e63491e557156ebf910a911b89b57cef845460b733da870cdfb99c965. 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/VNA0M1934655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa4d2884ea2b639e3291fd745ca90b3dc53229d5168e2b7742df42e975301cb. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/VNA0M1934656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7ef669f4d8feb60a3ae5f535534ed14b2dc96c4da3321b89f1c4ad50f26498. 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/VNA0M1934657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ab425ac92afc085b22f94eaae1d85b7dd20986b728e45baafa6ecbce395317. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/VNA0M1936447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3aefa71b9fd58b74707ea708da2c70d4a8fa85488e64a6b895ca1bd9d437d47. 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/VNA0M1939975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8f4c1f1ef0a8932bab87c31faa33d72b3af682164b35092a9138d9335ce02e. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/VNA092500256.