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 0x1e23e6ac32505a8c3d22899de87d8dd2e823e9c839a72bcd674b6735471a96a3. 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/da8cdd35-c0ad-415b-8ad1-11d6761d1fc6.json and https://artists.proofprofile.net/proofs/artist/da8cdd35-c0ad-415b-8ad1-11d6761d1fc6.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 0xb94c38b5500e49b37bb360668c40e9763ff8ae42aca655c474d0e2aec34d9430. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BEC631700048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c8c8d2ecc3724b949be00d7f36c631a9764464e8cd2349fa08e18709df82cf. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/BEC631700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94c38b5500e49b37bb360668c40e9763ff8ae42aca655c474d0e2aec34d9430. 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/BEC631700048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0ee3da028372d036d01feb788775b19fa571bbcedbe98dac0f31d5d8380b15. 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/BE5HY2400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bcdd57c7b907a4a4dc542e6ed85af4130fd2591c2eb67c4975629fd53436d6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/BE5HY2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bcdd57c7b907a4a4dc542e6ed85af4130fd2591c2eb67c4975629fd53436d6. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/BE5HY2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52982fb792ed647115e0af1debb8f5fc7158db993ededb3a7aa60dca2acce9a9. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BE5HY2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d660fc728857ac88b613c3e4af7e6ee5c4fe80cf758b0fa7b176ca9b3d44f6. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/BE5HY2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9bfb001a353e3aacc96f81a8a757def45314336f43404725b041410414b287. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/BE5HY2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad7a8bdcf5c5c8d0fe238661e2700c769091578f7edb2a11f2780e4a580cb51. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/BE5HY2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5db2c65355c0ae0b4152d3250d5ab0e97ec79efa72e0db66c537281a961a887. 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/BE5HY2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdddc99109a2c9def5c6e95a3750e5ea6e6b8771ea399482d88baf58280bdc02f. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/BE5HY2400024.