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 0xe9174123e29d5469e7b86f2fb7479502e6912b275e9b2f9e9d743e9507fb5283. 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/e2fd55e5-41a8-42f4-b44d-1bdafb7184b7.json and https://artists.proofprofile.net/proofs/artist/e2fd55e5-41a8-42f4-b44d-1bdafb7184b7.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 0xdce359ca261d2bd328aeab0509430617c006f8e7651afa92ab5916dcd613bd9a. 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/QZMEP2485226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134bb5e66399c2b4d4f9a3cd43358a2336c3391d9a7ac5e65c5bf1f17a10c27c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZDA62593589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95fb3e6a1ed21d40133dc4655c06b10da791a956298244721f8ba14d3f10c82. 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/QZDA62593590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a29f8d5c1b23fec2b941fc7017fd84de5d868b31245f245303d5c84e2f840d. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZDA62593591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c5689ca8316ceae23c2e6f301d7ef873fa50bd7fabca2dbd69c94971a3a869. 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/QZDA62593592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9935c34120dd3217072071f6a5a43f985474e2975521635e9fdd9a4100a9c4e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDA62593593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6127ec447759da01aca4b19cbf52f40dfa5e33baaa0acd43eb192392d9a71f. 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/QZDA62593594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04899a076365079a83f0bf83d89f368ac78590674fc7aee9ec9f2b22cf48a316. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTAU2563593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4337ae1582598e7c1d84e9f4d032a41e0e7a415d940cb36c1203e7be4d0f3f01. 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/QZTAU2563594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b04fcbddf4f65a6d494ce688cc6f0b6118cd039126e2cce9f18b2b8fb52f2cd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6L2590325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c7ba9aadea8c1e4725b59ddbfac64ebf7dff3c67baadbe7c22e290182ad432. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTAU2563595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb50876ca4b405dca14b1005ef351255ec13441d3cf58d4a2fd64d6be24fc5b1. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFQ2517237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6999980c5132b22621452d420253072c440700898053ec1a9004f455d954a3dd. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZWFQ2517238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5456c6e648bfe4cb9e50562cbcc2924595cbedb2133cf839e750c42e9cf70c7a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFQ2517239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7cd3cadbc4004e9624e034dee707425bfbc5c60377f4243f801412f2a7a83e. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWFQ2517241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9801966c83f21d1418a37df9555e1b9d8a5a707b5bfe79412bcbd3a2ee32afe. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3FA2516679.