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 0xe72d834d9d32f09fd9887d65a23e77f1ba11bd008e2270e8d3cb71b005dd3c46. 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/f0d51ad1-c782-458f-b583-7ef8fb360eb9.json and https://artists.proofprofile.net/proofs/artist/f0d51ad1-c782-458f-b583-7ef8fb360eb9.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 0x3f6534f49bc2c8cc8a7e5f5db76d7db199edad4be33167e8f02ed1501f12d720. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USPWN0810099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a711b7dbdcc39ce9ab3f46e91d0dd137a0aee7e32a86f9a17ad792d75a76e0d. 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/USPWN0810100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc921d066fca6160a00837e5001247113806ee90e8b08b6b28ee754840a80f598. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USPWN0810101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899f61bf968376bf9602ea47320ff34490eb2da5ba374e1303544ea9fe68a997. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USPWN0810102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dac7471decbf668a06fc008c71667612397485934f4d1a933f82ab5a49172c5. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USPWN0810105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d3ad95828ee09e664807d18959851e37bea76e5e94681da45c83d35df0ad4f. 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/USPWN0810106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2359e2342d4536ea3db08ee6a9de19630f06903b483854389ee51684b9bbc1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USPWN1200901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8995a1cb514cdb0b1d0855be7a3d593210e43f6a47b964e98f39b55fad760738. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USPWN1200902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c646749860be48c0f505281f761e3382f2f820dddac79fa92720d9bef5ddb5. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/USPWN1200903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5d6844a6d91fde507de6974035d187130095c69dec4119fcd07d65c2be405d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USPWN1200908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad52469abeef9fb898b0cdaad81819ca409737ae678688c8deacbbb421a63b0. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/USPWN1200916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d0ce3d64d199eddc949a04a5aa22f20cb03200396a5e5f30d0031cd3d632da. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USPWN1200920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7952df58b7096c2fbb09eb3c73e41d8ac2dfa5afea0fbac78eff3b797cd3cc73. Chain 2 (Bitcoin): anchored in block 957705 (2026-07-12T12:50:42Z), 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/USPWN1301220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd82d11b52abefb835213e5f6344d3ec018f810f8d6e6e00bf3f04b08f8bb24f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USPWN1301221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd545c6c748f93b7c0ed4fbba67f29664749a6b7070acdc9288476b787b30808f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USPWN1301224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea087833b72942481e4fc4bf0d1a5a8fb6ba5d082f813787af686688277e5be. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/USPWN1301228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4327d5ceac7e9582a1c0689a30c021a0e649bfbd1c922b06d1bae8e51fccc871. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USPWN1301229.