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 0x3516ddf6a2179ca68f911c69ab9dddbdad5e261569108ac042f476dc5f35fa36. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d81cd9a-95ed-4fa6-add2-106be1ca65a7.json and https://artists.proofprofile.net/proofs/artist/4d81cd9a-95ed-4fa6-add2-106be1ca65a7.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 0xe7e9332b785152d2e65096f9d253d5d860d0654efef4b8d215842ef4a44aa00c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:21:17Z), 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/HRA671500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b76342e92107a43d56143f6ee049cd6a1794ec6b375dadb2091d718206905d7. 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/HRA671500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102d07430e4f8b7a6b1ba9d5857782135d285ad297e9162eef413e3d3d1b912a. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/HRA672000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6404c027d0a909873d1d87e462e80ed57963ab5bddbc5fa8eb1c0e3e75bfff5. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/HRA672000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4bbd39af5a132c1cdd93379473c1d0caa9df00901ef3b591a74d82609fb16e. 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/HRA672000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc225785b5e71b0120b6e7764af17f4c040e0c0795d5b7cc9710a6e8ebb73aee2. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:09:23Z), 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/HRA672000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb5df844a72fa9722f3d8578854da15237fe3351a82351e2787dbbc9e013fd6. 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/HRA672000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2819ae9a881e546981ad5c9e7341dab6366f3b3a1b0f61257f832fbd4d971e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HRA672000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06528bea5456d0dd74d305e7f936bd82f8174773165a29002092ff759c0571a9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HRA672000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61dabc029852a246bd78456ecfbd2f111e50d55fb5b780e9be29a214246a52dc. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HRA672000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de72750c6d50ac0b25ae9b8806e864b091fae71520e454a8106aef99df8600d. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:30:29Z), 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/HRA672000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6637576acdcb38ddae512e379f3abc6295dd84b5122f1a3ccc230cb1ecdd0f. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/HRA672000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e0fb6fe9fb195d6cce4cd3d2f6db8c3c2e3c5afaa249b60d5edaf9ac1d176e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HRA672000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c249cf0748f8cf89d7093dbc27c811d6b23b1aace2693d203dd5c9b38727ae. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:54:01Z), 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/HRA672000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60aecf7e08b327fc2ab19f34bd6ce6efdcd938f3e8b64333c836db7fe86315a. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/HRA672000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35c9b976c61d03eec2ffb31bc01083a52cc9193d6d62a8c235ae56800b3d883. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:27:05Z), 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/HRA672000018.