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 0x25073323fe819c50d795c1656c84086ff134bd5814edc503fb858a50584d68a2. 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/118a000c-a9c5-4504-8ab8-a8e2f2a9f735.json and https://artists.proofprofile.net/proofs/artist/118a000c-a9c5-4504-8ab8-a8e2f2a9f735.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 0x7e6a3028eaa6e90e8d36b2e4e5a299344f424afb4102a44c90b8479ed7892519. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12501586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83298cbf8d99ab059a24c65cba4f7bf909bf87f933dbfc56c28cc3acd99dcad. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9W12501583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509fddb11b682cd26da43e0f5106e4df8cb07d93c22a1ee1c8a467f840bad02d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W12501575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4b848b71d3b148b315b65e8d6e61d7e85996f7b43db08146b499a738cef70b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12467305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f197f064c90233aab4106799d3578fa2f68b9dc9a0c55c3f6a3ebf11da30f0c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609cb555009525c9c80a9b206a936bf6e2e579d4e6f875ad28b2d8acfeab9c1e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303e929fa49f27059a940638af983a103e72b32792ead9107ee2757cb92f60c4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b10a9803de4c1331e4593fa7c6808bc9b6583a691e0e8a9c22abbacded4a62. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378922205cd39ed90c80598b4821f4a6adb47ec58164d91b11cdea913152cce6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee689421913a88dc429c2cd311f619c3e0d3fb914bf50abe616a5d83058fa68d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc36e85578ec657bef1b586934689e3365fa7214d0dc654d113f8fe24bc895a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83298cbf8d99ab059a24c65cba4f7bf909bf87f933dbfc56c28cc3acd99dcad. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05863794aa3b86dc949837a94564780c296c8a8910f20c0f4f549eecead56c2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a646c83675502b6cff9bf6dcdecc1b4d36e868d59aa2afbfae8b85c6f71753. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6a3028eaa6e90e8d36b2e4e5a299344f424afb4102a44c90b8479ed7892519. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12501586.