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 0xfb0f56e1f2291350790c6f7acea9b7f8054d9cc646b23456afabe7ca71d69913. 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/60525dbf-e056-4b29-9a8b-6eacf8ef17c7.json and https://artists.proofprofile.net/proofs/artist/60525dbf-e056-4b29-9a8b-6eacf8ef17c7.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 0x43a8ff1962720e263fba21b33cd31db1c42d20981f48577a73fa14b4443e9527. 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/QM4DW1791480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a3ef11a798bf9a18163c6e3b33521b08681d8d8914bf313a430f1a6e60a9fe. 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/QMPKX1755472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2d34af93d71a95eae192dcd786aac42d3d06efd1a8d9e4b6e4c97a84ad9677. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZANL1764699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44828f0e943f0427ece97aa119f24da14ebe912f95b7e713e83a6d4402d092a4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZBRF1819648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba209a00d8ba2091aa5e85e5b88f0b7c4e49d720a840637f344b43e32150ac3. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZCE61848718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e73e76f983d630e2f6edaa153db2bf6edec1cd5baa9f3c182cd5de2627c093. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA61844703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cdd761cb3ae35c05fb42d726e53eb669ad1a485c63f810b32c0493ad9c98b16. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZES51884644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e17d95e5166b64956455c1e12dfc03adda45e381ffb5c0c762382b3d8a1bcfa. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZHN71974557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5f4c18257de9b496979be522fd53b02d9ade5a2275382334a6375ed0a1bd08. 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/QZNWU2013684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d236edf8de8b684b8782b8a9c380dca56a95ad44ea58ad216751a3abf75ab7d. 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/QZDA52121247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78b2e843c9fad789f2cac06fa0f9527bee8e0bef7ec8cbf7e9b6790333a8575. 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/QZHN72281528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2c764434d92667c8e5a561fd6f2dd2d0d4090b3d3260b41502c1915f2e25d5. 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/BC9PK2300086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f916dd418d5e694071c60147658599dcaab3c68f406bdf0ebeff6a7aabdb851. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWDE2316789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a42123cc4c7321203ab576f22bbae759fdafa0fd6f7604fddf30eb39c0c337f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX40Q2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85746d935569e00064dc9806064e0d42c73ef23a10d865f6f33a8d70434cbdb. 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/BXYGQ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58411c29a35441aa3c268b09b41ed9734228f4a362dbe73c0bfa9b6323fbfd3. 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/BCJVY2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3138f9f5805f676de1ed66b7448c19439737b801ad92f199d738dfa1b678bc1a. 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/BCJVY2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f640594a4cf55c27d78bc13d855eb1a475ddb25de479810a4fe8d7d9fa0b81. 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/BCJVY2200001.