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 0xc9c32be4f5cebce4a9383bb79535ad9c5f71cb2ec30c3bc8e4080ea7ab005782. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b881581-f442-4988-88c8-161b445e6ca1.json and https://artists.proofprofile.net/proofs/artist/9b881581-f442-4988-88c8-161b445e6ca1.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 0x4cdf4c0af185a41a06ffb25de2384dbd6c31cb1aa317975124896d64920694c0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR2X42216673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b02190175db6cb200d31f68ac872114647fc645306031278551755881bc5b7. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/FR2X42216675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf023d8098747a1f560fc9723d1c2c670fc7ad875ab8671aa816aefc5c1c9df2. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/FR2X42216679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f595ecb5499dadde6f8e1f505f9bcbfc3f64f82d0d1d17114631a5a5d67e7c. 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/GX5NN2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f595ecb5499dadde6f8e1f505f9bcbfc3f64f82d0d1d17114631a5a5d67e7c. 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/GX5NN2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4938925d09faa5a08c6a38beae64cab99be457ef8a31e16076028a37a75cdd5f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX5NN2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddd0fbdb2938afcbd66c478e54b03bdad843b3873ff7ebaaad22b308dfb4a1b. 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/UKN6R2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e6ac2d0a18c98f169fffe59256574e137c3c49bf5d0d2a22bd464787047434. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/UKN6R2000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6992013ef9c94c57d3a5cd8830173335272ccbf3054d73c2809e989ad7b9951. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/UKN6R2000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67a70277fea493a1464beafaf87a7d661a57379eceadc5cc107cdc4b8f06897. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/UKN6R2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8628ae0ff65c4c56fd152b3a271b43e1665c15e87d876b3c5c35e9310c0e212. 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/UKN6R2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8033d8579399373436b6ad825803a9f8aef5116c52aacc271a432a50d2793fb8. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/UKN6R2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2d154b618fe4776ff8ffb2a287bfdd42bf4763da33024a93fca508937985b5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/UKN6R2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d597d6ad3e3636badbfad75d0002ca14b693fdb53d731eeca874d0aa8f8d16f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/UKN6R2000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9c7de26122b36577cb7e8f13e577c2ca222a7608d29d8b56d4d61d2ff2ba95. 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/UKN6R2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7d8dd18ffc944c3969b2c8805d669ad619d6d926b8b66a93630ea331af204b. 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/UKN6R2000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce7eda4480e68e55eeff347a3166c13dd55939507cafa2a68582398b5fb0cbe. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/UKN6R2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1a2e5eefd72d6f95e6ca3e7698277fe176167180a702f86ec18258b9a84086. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKN6R2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89685b0904c46e2160b075ce0b74a468703c6bbd86d0ba0e0184fadfc295693b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/UKN6R2000031.