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 0x9ab181d567c5b66095c0280dbf37a857305f2545bcf8641221ecdf9ada59c07d. 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/86e02c93-e240-4f2e-96a5-c452ed1f7223.json and https://artists.proofprofile.net/proofs/artist/86e02c93-e240-4f2e-96a5-c452ed1f7223.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 0x3d2f40eb5188c1734c1a2b5f2a734dad3aa1d169656aa9378d69c7dd7337ea35. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:24:57Z), 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/FR59R2128851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c5babb5c507530954f3a7f684f35346ee4d34d67ffa53a87592667fb80d825. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/FRX452186410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba937a8323d9338d2e19a181e4f2f73950acf99cdb3d02b47522a17b4e1f15a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FRX872161653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dadf9dfc70c08c8c2d44efa956d59fba5ea6a23209eed25f8588e914a243cba. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR10S2235367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655760b56e7052e4a771f87067e5787d5abb4b6a7117c1583bc81bb2d2f63ba2. 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/TCAGM2210712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91ae2db4463f44a743de05cb996b0a328872cc09e313a3770d867e60e80f476. 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/TCAHE2339670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83097a0a0b3761f3b61aa11348ed994feccd153589b2726a1d19b4f85a58a50. 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/TCAHD2303999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b6358fa0a3d463380aa38422fdcb3a4bbdd6633eb88aa8d689afaaa4996573. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAHE2339691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede29bb620e6ca76cf1e42aaf3ac513568922ea1df825de75df71580fa62143d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRECK2300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b63ccf4dd21cdff5dda173429b480581b8c911b4140e3c94c8662b5b95cde55. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BEUM71700329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280d2f867f5b7716a335de6364d225ffb03aea19370e5f9a1573740a278cdf26. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BEEI51600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2b7aaca4039f1eacbae6c859be1865ebc2ce0f4c41736550f5fecc27e64c67. 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/TCAHM2349150.