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 0x10abc2e71a78e4630deb5800292f70052d5bc284fc2783f9f0a26a52b65de918. Chain 2 (Bitcoin): anchored in block 954040 (2026-06-17T03:05:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ec20c94-c10e-4f6e-8f92-fa2189f01326.json and https://artists.proofprofile.net/proofs/artist/3ec20c94-c10e-4f6e-8f92-fa2189f01326.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 0xc41a7613b29da4ca66c3b3a4e966d265d9db8117d0107d223ef8d605c3f46e6e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZNJW2452194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4ca7bb7234a52c38063e81e9c2a0b31840cb6d91bb6e44ad971f6345a28c2c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZNJV2422664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9492fc0ecd4194a07716fe764f2fcc25f31417daebad7faee53503271577d91. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZGLS2494650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88650bdc7b19d35497d78b2f3bff6d47fdfb4c1d800c545d69a9c13578ccaa1f. 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/QZMZ92214218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde97db44261e40ca9ca61c2343830fdee5cffd7ab9e6c5b96cb71f23b23efa8f. 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/USA2P1935184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ff95f71ab0d8a669a945050de984c63d7aab270364acdb0176592d728a4274. 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/QZ5AB2407693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0675cf8e12da54d2685ca69d688c0f8831f118e3e0a0856d4ea9c5f2b19ed8a6. 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/QZ5AB2407695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688e38607074d917f6748b5a21adfb993d04d39eedfac4e23b32e21d13276c19. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZ5AB2407696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92322c87a1e09db8331b93a0d2581415c5cb6f5619369305e072dc79696b2a5b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZ5AB2407697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f9e78be27b82ae13bb6bfdd79bc7cf943d61a8ef6128ce3f1ad097bc256613. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZ5AB2407699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631ad8056051596a6729ad178fab0a5f57fe59c7d13984608dc44efe7de33779. 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/QZ5AB2407702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ea41948b6d328edbe787c8b312b0526a9aeee4ae620691614cd9f44699e7a1. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMRTJ2101140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f30bc4aba9e01d3600d4ccaa11fd07f219d6435c27f70401c4bbd79c3e4f8ac. 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/QMRTJ2101141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8058f48caefb292bcef2eb43b804d33b527d6f73c1cd492cb34c0464f55679b1. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMRTJ2101142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a119469e37c72bc8f1dd74730477012692491e7aa3411ed9a3f21832ff036c3. 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/QMRTJ2101144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6f90c088cbdf994a816a55158f1ac323c6a9f9e3753cc65ebb25ef90a584b8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USUYG1383094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3dc2ccf29b508a168b149b3935a485baee4f507822622db296cb1d0d4923aea. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USUYG1383095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9410f704cb0a9e020f25042670c8cf4043431dbb62c1c7eb4b9f43318a7e00d. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USUYG1383099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035330af40235c679d181f0b551c05e43f385b1460a6902d7f6c541fb64abd1f. 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/USXXP2100378.