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 0x072bf1ca9be18b0952242c73940592727130ac8a9d4dd55278cf39824083fbe4. 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/2b330ebf-d9a0-401c-9fdd-a3d52bd61fc3.json and https://artists.proofprofile.net/proofs/artist/2b330ebf-d9a0-401c-9fdd-a3d52bd61fc3.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 0xc2e2f29803e93cd1715367e849d2e3a9fb5fb0f573bb091f1d941a7e1e3d13e4. 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/QZ5AB1907189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4816579ce58c95773b3a56230feffcdb92d3da65565a44686cf2005c3c86c3. Chain 2 (Bitcoin): anchored in block 957703 (2026-07-12T12:26:40Z), 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/QZ5AB1907190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8cc410c4ecf1d3521d508fff48d79fccb16fa9ec8092876717da56a5db6a32. 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/QZ5AB1907191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a759ff4d95b7df03552b8bfa2377bbc554d1d33c97dccfe01d8f078bdababa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5AB1907193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc098647a88257e5bcb073cd5a0c05203577ebc5d113d3e1fb68e1ec3e157d7. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:10:29Z), 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/QZ5AB1907194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e545cee253dcb076fdaa64da0952806400c991a56fdf5c7bfe636491d21bf1. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZ5AB1907196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aac1ef001660963043221464e6da7e56afbcef56f5e24ab6f20314bac411086. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZ5AB1907197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a61cd012427fc56b0877a930764789d0de653746491569a7033a9dc1c6779b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZ5AB1907198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a803a8358a3767b458f09634fbcf6ff72ee78391f3a97c6ba5519c45ae8af5. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/QZ8DB1700197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7099d4239a99f9cc81c3c281a9613e884cdc75c8770faaf5b58731b587f4edd6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZ8DB1700203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3d5deca4eef828e26b91bf928389aa5f9fcf5cc40ebf193f162c3cf3fb5448. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZ8DB1700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88f7d108f5d6e9f6c80e754a4f7d067d8d710ae224ecb750248ab115c83ba81. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZ8DB1700205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfba0799b266a2c6cfabb0eebfe9846b816258a58e70ee387be6bae195eb665b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZ8DB1700206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f0b420e27132395171f53287630d4e8d6565ac8fe64b566fe47485830cf4ff. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZ8DB1700207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3613465d6ec90d629fc2ea26b295e13dc4da881b98dad60ab6966f2a86e4a1. 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/QZ8DB1700208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7274450ca641cbd6f8736c4cd3f7a901930a80c6d3f9c48294f3916e278b615. 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/QZ8DB1700276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb0ca0d57e9cdad9ee0571a2989a4d4b38ba0f5089f2cd2edba835c13c46660. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/QZ8DB1700705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cd1a9ad7c3af260706fa8a919fddc9761e722bdbea1b7aca362ca14d9b1c24. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHW2483161.