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 0x0ee51bb4a5fa2662685a10d931b887a3f7d5844e5a20f7e947638b993cb1edd4. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/94b728ba-6aed-4435-a4c1-4222e9511a6f.json and https://artists.proofprofile.net/proofs/artist/94b728ba-6aed-4435-a4c1-4222e9511a6f.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 0xc1c87e770781a51cda0270c8e47f01675539e17edfcdd8e4d3cda0b4f1e1b13e. 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/US7VG1901146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e915eb3e85e306a628012ef88406344391c6ee7692e652085762daa03ddc75b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG1901147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c0e7b252cfece10e6b7c901c0f690464797eac3719cabadb2f06db8331651c. 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/US7VG1901148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc99a74ec1ded7e59fc7e8b52f1ce3f6cea5ea8274ae946deb0a7f84821995af. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/US7VG1901149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265aa8cf9d78c8dffff5b2c622bab74cd03d8b47ba037809275973c3cc181492. 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/US7VG1901150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e2afd78ec41cb7331fca3cc2bb97a578d888f62eff35f6f945bf52f2785ec3. 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/US7VG1901151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97b0d58e8715fb102af602e9de1d9dfb2445e08a6062a99dd4db28cb9ddb8e6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG1901152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cfb25ce5591888282ae3826d1d600418333f86d4fdfc08e07281fed5137eca. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US7VG1901153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0facdf7d95cb37eee3374661faa0ce80c5507ce8cb781a27dd4741b8c18ae6ba. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG1901154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7defa9d3c338471f9fa650f35af4ecfbbd3473439c86821b19f81a91ad62e10. 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/US7VG1901155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74b57be6330a7ad1e63bd288915553430ab2ead5b3cc8533f841c5b7e3ff5be. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/US7VG1901156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de5223dc5e9d26d89f823f6d4ebac8956ba43a51f2420dabc0599900558f061. 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/US7VG1901157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141ee5d68fbc79b43797a765dbae7c4ac9bb399687cd1331b4ef4f332b308df9. 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/US7VG1901158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a1b14a8003843e063039909e3b37b9fee74621fabd0a3f9387dc3c18f5fd61. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US7VG1901159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86c6256218e42fe393cde337739667da655af8a6564fd203a049da614ec16bd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG1943726.