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 0x59c144f5a4713169494b707adb917984d37b1c3e3219850515ae8e46e056d294. 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/456ca2ec-fa63-42ba-ba46-03ea1390e2fa.json and https://artists.proofprofile.net/proofs/artist/456ca2ec-fa63-42ba-ba46-03ea1390e2fa.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 0xa843fc3b88e7454a40de50aec6077c7ea4e041332de7e891e620c08f6897bc5f. Chain 2 (Bitcoin): anchored in block 957561 (2026-07-11T11:41:29Z), 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/QZWFF2334757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bed5694a89805f06cc911188dfcc82bfe009e2f5aa2518f425a93a0ccb90cf. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFL2363153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed318f31889610c37b5b24f2e6ec562446e5cad14f456098221f55f1cbf0a13. 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/QZES72453893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e6e0bc61385549a3ffe4b658456a55f9e80318701c9fcd500185e66d8ae978. 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/QZHN42450707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216ccdcf9d132ae566402e1675b33d779817fb2c2b7d2ec39dd06d300fe68fef. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN82473152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21920a9ae67a522d8b9a837b720f310ef01230668f6d63eeb1564f9f215d203b. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZK6Q2450656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c1914405fb89d409570972cb66e1c5d97a901ddf664813b8cd46c692d122cb. 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/QZK6G2442487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b94fe2a4567d46509b502b86f634c44f177aa9bdefa1eb5f085bcd4f891d97a. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZNWQ2478308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa843fc3b88e7454a40de50aec6077c7ea4e041332de7e891e620c08f6897bc5f. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZWFF2334757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44be7ebcb9de790edc0dd511cb199a5e01e7265bf2a257e77fd8fd309db77202. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZNWQ2478309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704f44ece0cb7d193f6c0ed66e654bbd1d5181eb05905425f3dc179f25e5ae3f. 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/QZNWQ2478310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf9e2cb48843fd138821bb290ff563750cbf64a4924265e5facd7724f1d3f4e. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZNWQ2478311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa04542d74a29cf5eab4fd31dda51189a7f2a6aae26a56d3dd8fd8ec92d87d6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZTAY2430192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477820ed053131582ef271a8666b31ad3307caec2d2ddf8fd60dcf94b31a658c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTBB2443175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf952a652f0a63a14009e8b673e28a3f1d19c9dde728ee93e82cb61f07a13acdc. 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/QZTBC2471106.