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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43811f98ea25a8ac0b78725f8ae95b309fda07700394f2df519e9b1514517884. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8b616ac-f0d8-44ca-a813-e71cc6d564df.json and https://artists.proofprofile.net/proofs/artist/e8b616ac-f0d8-44ca-a813-e71cc6d564df.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd399c8effa87d1734832df5f0ca50b9f6ea81588e72a5eef2e5d74a100fb43e0. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZ5FN2056848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60658563a90cc538e3cd8430de91775b89794c5a6a6d5c5bef51d00cfb796e42. 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/QZTRX2345085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2df1324fa90c861cfc9cb021399a2b1c94ca43ebdd1f15975986c3cee6291f. 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/QZTRX2345203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f148b24401c92b8cf6e57e3495bdb781f4ee08632de3b2f11f6a0453ca5a8d7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZTRX2345135.
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 0xc62194b0d82ab0c8deda659802db32fabd679fe866ca0bbf017f95f62cea2257. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZTRX2345181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9a58761c70a590451cc47990b5f423371ec681d85a49f1b4493b6125cd62ab. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTRX2345219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e4c1de6d32f384cad9fd73c59b630ddad706e38756b43bf10b545b0d52a3aa. 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/QZZ8B2344565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b35c538de63ba4d16b63d388fd9da8ac627c65817c48995d89505772af3c2e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTRX2445818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9b66bfdc321f687a35e6d655845fe6b54f9805ebc5b70b004f6003e9842797. 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/QZZ782499425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f2ab9e819b1b2e44ffef0f7f31103ede4cf7db2e4211e83eaef5e97ba01dda. 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/QZWDE2324723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcea72f58515d76c72ab460286f64dc09c2c6b23e11cd0dcb7c2759cbf15903. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHN62572205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fcae4418b5d022c3c4acac12829425490578ff38e197c30c14bbf6600ef462. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:35:18Z), 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/QZHN62572206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640dd61fbbd93f07dbd2a9a32ee85dc98518b7ea7df3331c80a5105f5c3dd6b9. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHN62572207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046bf0e9404dc83797a5f41c651f428544e04aa5f8d2b9f56a2b0948443c798c. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:43:53Z), 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/QZHN62572208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4aa8a919f14f56f1aa51a32b6f1e3e1bea039f8279ec6e260280d4f2c6183b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZHN62572209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294fb5b55b6619f8d6a789c283e52b97a068bf2ae1226af610bef01f0a39fef3. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:52:28Z), 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/QZHN62572210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc39c4d4ab8c3809837a13779137e6d6af21459477a1050e0b717c438461ea16. 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/QZHN62572211.