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 0xbaf467378277b9f3ecec1a769679e4fcaa5c3944f28ac3bc34b2d320b8cb1ba7. 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/610fc219-8f45-4781-827d-e324e8fccaeb.json and https://artists.proofprofile.net/proofs/artist/610fc219-8f45-4781-827d-e324e8fccaeb.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 0x3845f5ad89d275cd50cb589be41b86108c5f3a77399c100632c7358fd0fde18b. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USL4R2015519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378a02f8cebbd50e8cc7b2369610e4dd4386ea07f3d05d29e9f77bb77cc3ef3f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USL4R2015524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71ba9845c7cb997cdada6ac84b6f06feeb8f11722d95659ad99b151aa9c6e0c. 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/GBMA22094102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c35987e8bcbe3d30ce52d500b4febb0b474caebb547977488fad8167579f5e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USL4R2042363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7cf807666e3a00a141a65d77a303b7f40ac455cd413062921484e6803f42b9. 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/USL4R2042364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5192700ab3f2567e413e77710c38badc9ad621a2cbfe871550be4db8854b7066. 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/USL4R2042365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30621eff166397ae04cf5f499f764088b50ba35406be971c8d98fa656d3bdab. 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/USL4R2042366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c5667554d679dd0718baa116bcf5cbc71a7e7297d488cd6c67a5437c4fe644. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USL4R2042368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1985755205873ec6a232842625f3b646526e9f614eb7cb9ca1f8dec2edba9a3b. 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/USL4R2042371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2d317d28fbfdd5d3133c054348b4e7ad16e1c093fabc888df04f159a1abdc7. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USL4R2057897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc4ac31ebdb937978c1fccf43fd5cb9d587a800f7897f79723c9b8ffd7a9e2b. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USL4R2057900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b22cca811bdcf836590157d5afc82af2228c8127eae55b2488e41581188570d. 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/USL4R2057901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7562cfa4352b2f165e683a4b6561720b269324ba1436cd35522b7fb1920bbac5. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USMH92326845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf364a4275ee29c8a19e8aa427d69793c4a44b5fae2af99c84b930cf10c2f95. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USHM82425795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a666079dfa1f8071761d66ebf888b295452fdcc7117ea9d417e7961a1bde00. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM82425803.