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 0xeebe79d97f91f9351c9695dcc25873b7d6d744a8e32cc388f23f9d7e5477faef. 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/9fbfd2c3-d7d8-4af8-b6d3-df9ac7942923.json and https://artists.proofprofile.net/proofs/artist/9fbfd2c3-d7d8-4af8-b6d3-df9ac7942923.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 0x7ae8025798947977ce91ac5bda9d6459e731af3d41ebcc7d867715ae4b534b38. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T16:01:29Z), 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/GB7YL1997702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e351b788005822e1be56f80b8283e0dccf3db398f1d067e6bfee433b7fbc48. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZFZ41953501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4393b2334ed46712fde90a8d272771bb31a2f37e418a00e4512974986f8682e5. 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/CA5KR2076628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476e89ff783ee071223c0b80de2032661e95cfa76b3338db2f475a6b22a56fbb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GB7YL2000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31f92aa62eb26a9a29e9904747328ff73e304d79f822c19d43680d092878479. 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/CA5KR2091426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df1df2b23c92ef323936b71682d3635dd8fadb6746ce304b010faac6232be87. 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/CA5KR2099754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6577d58537b9158ba98ec77d04e9b7df431f69384e4a2812a795da2d98cb3d. 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/CA5KR0012287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1689d0c97aaef288ed5c7e8073842fc635c55681cee3ebf8f0ee23bd03149d55. 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/CA5KR2201293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c2c8c446de33487beb38c4e322a4bd1b80c1b22dba37f8fe2bd10787cb087d. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/CA5KR2234820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030d04d7691a2d517c2223be805ab1c960239be821abaff8c550fa8cec0741fe. 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/CA5KR2243870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe386e51ed5d7529b5414aceef553ff91a40e4626a1517cac3b4f98af814542f7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CA5KR2281674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1896f669b64419ed84e174845dc1fd48ea475b434f4f0ad75ef0e3427787812. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/CA5KR2324299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f726eb9cbf33e077f4a499a5c934dc7b9239b076fe785b2a8d9e343e7ea2d6a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CA5KR2432297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b55f8d5c2d37e13aecc47ddf65c576406d459c27abd7e6b5067c6804bf62642. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CA5KR2432298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c473cda5afa022987f71d356659eac051cefbe6f9c6940c5aaf65cb3f7f44d. 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/QZTGW2404311.