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 0x48efeabfad7f76e351addbf18a110c2108ae038f8850f2eaddc89230e7d840b7. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c2091d2-5bbc-4493-aa9f-6beef8a0343c.json and https://artists.proofprofile.net/proofs/artist/5c2091d2-5bbc-4493-aa9f-6beef8a0343c.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 0x707052eb09f4fd42232568bf8fd6848acc2b9cf0139e49a401f8e339997ca3f7. 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/US8JW1400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad74e2a6442079f7eb3ff9436e2875c571008f0ba5f6fbb290ae0de15d4e6ce1. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US8JW1400202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa3f238f6f45d763f8298463a171eaa3f5ec2762858b8bb8a2ada724d9ea764. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US8JW1400204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0760f0a6b3437283b77e40ea762e29ec993ba4dd7857af26e9336ede7cf94f9b. 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/US8JW1400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0074833b882193f0ba4f0e6ecb686c3260fb8c9292d8270729472bd7e48f5e63. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/US8JW1400207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777c5cd080ceceb8ab77c1c030eadcc2e09dd184dd01924ab557811f012a0185. 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/US8JW1400208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe037fea72f2dfbe0898dba1b89053df68f950e6c500c5dbb95f8399e4adc76a1. 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/US8JW1400209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc619e9d0424bfa4e3934c8ebab5ef0401ed121290eb7588705c30848a25fdd41. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US8JW1400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd408063e00049d293ff79e6ed4a846a24f3088fe2a714f7cba27667f2474d1. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBHFE0630116.