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 0xdc5c9cd0a48787d99af336262f05066a6a51651360cbdc26a0c5530a5ffd5e24. 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/7a428d29-a682-429d-a577-d2ea7bc21fec.json and https://artists.proofprofile.net/proofs/artist/7a428d29-a682-429d-a577-d2ea7bc21fec.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 0xcb0d4c55be084e1031a3da06a580347382604d5d34c7d3415d98b105f035fad6. 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/CH7811101031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d8c62432dbcafe226a594e77757dc2b5a46188193c489457255f2dfe3d8818. 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/CH7811101033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b49140cb068b0fc90582341740f3c7c826829a9a533cfdb4b15fd82243943ce. 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/CH7811101041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5f37684a85fc371a31755def6d110a3509d94b6aeaa772a7e4aae73b51154c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US5JQ0900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ad7613c2bcc6d0519d7cb5a5a8f2be74780091604b715173895ce27f68770d. 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/US5JQ0900049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0db7efae2b700f94d2cce4519ccc63bb8dd37e006d36d9b65537cb3009f87aa. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USUYG1008012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76a626784b39f78f390e0f5ed6ce65c5b611a7a7ee6a694b8f67148ecbce467. 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/USUYG1008013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc569267873134350a56fb0d367f712fccc50d9bf5d2398aef931c79ab317a01d. 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/USUYG1008014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814242358fc359704f5bd75b0489ae7c7a5bd67b6760144a2d2a8efdc909bd26. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USUYG1008016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb85eda46e2d3eeae0e80a65501f0cdcbabc10683c986910d59dec4658ffdcaa. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USUYG1040963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f966b36774252c6c73effba0407641a011d0923835ea31b0a7504e762bd2997. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USUYG1040957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4c352ce7c2400bdc2656a9300afe54bc82cb10d6298a92e7c40557d3245190. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCACM1697970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5de77920f345f6abd9917eb204ed3ffa6814b73cb7b07363223a08f98dd320d. 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/TCACL1640022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694c994ae50ebc971a7fd97543c7dbccdfb06978920200ba4ff010cc9093a4bf. 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/USA2P1617743.