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 0x74b4bfb7c96f99638950c9346f6c7655d4af9f2e4c62c9ca977e80873bd54814. 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/cbe79410-c1fa-4ed3-b23b-2abe7c6eac81.json and https://artists.proofprofile.net/proofs/artist/cbe79410-c1fa-4ed3-b23b-2abe7c6eac81.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 0x7feb64a1035cb02aad74ce59aa6067cf15aaf82e1b34c709981b6ff70073bfa7. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/DEAE62200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5453448e8b2ae9e02e5511e590d130d6389ba71170d101e9303bff88b6fcf9d. 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/DEAE62200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313027573400fba12c614c131a78762399fe6c861e6972531cefa24fe4c39afb. 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/DEAE60000293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b762d27cd6afefd9f3f9e7339f02956523c932923bec53ce3088cb54d19da0. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:50:58Z), 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/DEAE60000292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96b8ae441d01b1985c53527fa665bdf1968901fba9951c6d1f9c6b010904f72. 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/DEAE62400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945e7624173f80887bcc297f349b28ed00d3cdd4971123e3de2a2f7524da110b. 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/DEAE62400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6aa04ed79a3a60c8bcf3fa580501fc6e8f004fba88898cd45f05ff6ae099c95. 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/NLCK42500285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dc0c50ec56101221d1e5dcb86fff34f8ddb5c05c2b906c22e4acdc40d90b19. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/NLCK42500286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a0aa1750481d63f126647fa79616d1d47aa2b08b345c9a18284a6c7377bf83. 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/NLCK42500287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249371c59dc5ad26e1ed38f3f068e4d95462dce877603961f79525c79d05194a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T01:40:42Z), 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/NLCK42500288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4d4b3d3f5beb8b01f98b3b89a7232e288b1ace6877708365af00d36976ef12. 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/DEAE62400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207b587966fed45b1c789d41027abbbc969a8d739d2552339f1d08b70066ca48. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/DEAE62500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d5298e2982df5489be1bbdd3f915c5d5042bc44968f76b90aca8d012d68ed8. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:05:57Z), 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/DEAE62500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04fb9a56342ad02c88e1284afab2a44246de3242601bd99b230f50d1b65489f. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/DEAE62500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc752abb4575185198258ee2d29568d5d9b9394fa8a750d6a007d2f4571743724. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:40:20Z), 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/DEAE62500010.