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 0xef1da6fbb01531c9148bb1f15ba8d65420b5f4c7bcf20552e8bd4d3b633bce8f. 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/a82df142-9888-4042-a53c-1e9c19e23c36.json and https://artists.proofprofile.net/proofs/artist/a82df142-9888-4042-a53c-1e9c19e23c36.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 0x5265c3c5b023415c6d1b08b598aea00b4ee162342f9b164c09f5586a1356d087. 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/BX1TU2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f932f321569718fc19629cd842d3ef36122796801c35528b7a7a300a13752f. 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/BXENO2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb750132b2057dbe988688393c0d672caa57a4ec377e81ae17213f388de71d28. 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/BXENO2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1a8628d53953c7a16b2e4556d16582b9afcb8af44351a2c17dd61de042e4de. 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/BXENO2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ba7727fabd29fbe739c896587b8fcf1f42fda481e4c1ba2e47622099d524d9. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/BXENO2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe009b87ec0e099621983e9646459dc85a421fcd4e9f43531fef93bb1e3b1c7b4. 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/BXSKP2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76eec16190b5ade79c9bd48475321ea17140b5e63dad6cd009ab73793f810d9. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/BXSKP2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb197cca3797335cd38af54ad41fe0f80b15bc9c3ed165cf74feb34af3f65a8e9. 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/QZWDD2309207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff130544b3e58f5cc1db8c5cec8a21b42cfda883c951e4d4d31c062d8a35c4f. 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/BXENO2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2723b537f1bb8137b4af5e9f0eb5623e6813ff794c4efbda673ba95f0d73f578. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/BXENO2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c50bd1f5bf6d377f002f13b242e465dc6cb44892db6259c7f7ce05011c18bf. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:07:48Z), 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/BXENO2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a945307af20df816715829943bebd62cfe0a3389cf206a84f3d60d0a9feca19. 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/BCUGR2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db7e56034f557fc247ae703b7208c977c77c62273b53218cc285dc815adaa58. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ8A2480704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad03067dabea1122717a7e383f60e777118e68b26cdb9007245a4d04a418bd8. 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/QZWDD2202934.