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 0x6979ccccbc3ba8fcfddc9dd50b5585cbcaf7c0a9dab01f71aaa860a308661707. 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/7a5aa131-00ed-4062-9bfb-0a351cd4942e.json and https://artists.proofprofile.net/proofs/artist/7a5aa131-00ed-4062-9bfb-0a351cd4942e.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 0xe2420b2e8c644a117c8533f1ca7810117ecddaa627027a5d22aaef659747eb92. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TR0260600181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e68afd69b28876052e8d4785209b5c9720d857ef7f1a4728790018a52c8ecf. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TR0260600173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f6c33bd1109274923539d1c9ad70fba99603b56c9f601014049b4dbf5c1393. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TR0260600175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837bdc45a1143e08706270025a45d241c953615f1f625cdb1ea7783ea3cfd280. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TR0150700407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9284320dff10d1c1259c419040ca30c9b209dfcfabf50a320fbe2d791f94c1. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/TR0150700408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf463e54f41b634942213dd0d644f7e487557e933a5cfeaaf38dab695604c659f. 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/TR0151000132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf543f711950a2414c2b7f2ba4a59c1eea0b95928b024af63f483bbc12490019a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TR2061300914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d3f296d909a9f8be094fd09616b78a87bc4e44456eca61f35384c01f6f5974. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/TR9931900347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fc04cf7a684f8cdc5b21a7d6a4db3942050882f0180e52ef9749e151b4af3c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TR9931900350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35b056cabfeea280849295e76018f6957ac817e8a0a5413a0b6fea564fc6ff9. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/TR9931900353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae3bd5824aac07ce38dde5fdac2c2de87a8b1dbfcb7acf6eeec21a424146a4d. 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/TR9932300683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d577f1db0535211b38c3f1359edcd8512b60ecc09bc59a39c9f8c31f09b04f. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TR2062401552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ff6e773ed5d3670b9d9f9d59d76de07f82a8fb55255ca604d84691d906e3ae. 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/TR2062501590.