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 0xad83fbb77f7d40bb319259b3225e59a510b2b3d7328ca5e51236083608dc31e3. Chain 2 (Bitcoin): anchored in block 953976 (2026-06-16T16:55:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2bc245c3-366e-45f2-8e2b-b7fdcdcbf11d.json and https://artists.proofprofile.net/proofs/artist/2bc245c3-366e-45f2-8e2b-b7fdcdcbf11d.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 0xb1e887137847e2d6263ce4ed5373f283549eba1fd398eee45472e2cdb8e66b65. 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/QMREU2100466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414fe4e6d3b992d7c3ff7ba9a3636ba0d7a3bf6fb0233157af5f569fd6ad6350. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMREU2100474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159a98379264648cacf6ccc8553ebf208172496f66d23b8a49206b76f8f54313. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QMREU2100482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271e580a50bb9db4a63fe39e785eb46340b910c2237be343d5329ea7f844b41d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QMREU2100490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf693b8f3a6006cc1ccfd51021a9bd0ced9897ee66eacb80cd0ae8bc4964459a4. 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/QMREU2100498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d46b96cc717cda137110b8be2b06971aee28b6ef65417efbcb71fd7080421a5. 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/QMREU2100522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476daa70e085d54bfb8e74b231d033780b71c15f70df991e737d2fcf8dd57dde. 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/QMREU2100530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3144aeab163d32796f3d0324f760abc94ab180366b00afd2f1b98baa5bd91aa5. 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/QMREU2100538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ad44bf384aeb2a147bcacc38a6cc8c00b7072a137ff90b40447e5a3af429c6. 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/QMREU2100546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2443da535022e928736cd7bca03248361a83a8bf343f4038187b2cb78db2769. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GB9H92304601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ec76fe8bbf782160d5ebc3a0abf5ac7af1b83e84891537f1dca5be1231c4d6. 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/GB9H92304602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b483f01825aba2ed6d782ae36fe44fc9fb5289a3638657bc592c6f097a3af3. 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/GB9H92304603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5b3848b0df371ed04f9a1153b7374ba85f41d7c3c2ddb4fc900a448a4a6b63. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GB9H92304604.