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 0x47a3bcf87e5cbd3d15385b25169ee40d366cd919191f35011779396827cbd8ec. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4ad5d2c-3a42-4fad-b89e-27a44eb137bc.json and https://artists.proofprofile.net/proofs/artist/b4ad5d2c-3a42-4fad-b89e-27a44eb137bc.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 0x465e22e4d8341db30786b3242629f884a628b389b26ad2d3b5ba912b55d49c04. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKC5J2101001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf91866cf6cad7f4047d23ccd02733219663fe33caf71c070d05aa98ff8a5d8b. 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/DKC5J2200501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8029d9ed559c593583ba632afee1801109cedc3b8e76384c769af392230ed3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKC5J2201001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17abf7b6919e6c4ba3ac1d69bbab7d6ad18d377643d29bee22ffdcde16998fec. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DKC5J2200701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfe54cc22fbb671c218a890d1072ea6e36282aab34c049b244182713827c6c2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKC5J2100701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0954cc61eb181f5355347c30fe576ac96ac9618676b0ba0ccae2d09045fa1d7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DKC5J2201801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65de35f4c8f7b8564888641666a893cffc548ee1ac76f736f2880c18232a1704. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/DKQP52101301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02dd7b84f2d7f9eb8c3916b1dfdc1660d029da194da4dcf80c9848e346c330c9. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DKC5J2200801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569c3c6fa0c86d7bea2c4bc3df4f2903e98eac8cd493f7c7fa66258c39d08463. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DKC5J2201301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17abf7b6919e6c4ba3ac1d69bbab7d6ad18d377643d29bee22ffdcde16998fec. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DKC5J2200701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535c7ceb4730ad36d1baddfe2b96365548664ae5ac4bc1eb99a3a078f48547eb. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DKC5J2401003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4a38e641a61dc913321d34318ebb6166b38dc9ec1d29b37c9b18c796e5b1a3. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZTAW2222742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9eb71110cc9e29a800b635c241e1657279ee9b984e9729e9f4062e1f9ca9204. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTAW2222743.