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 0xc8b9494498349c3f62fa7d84dcd4081058e216da85ff1ec34239818691f629fc. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54d328ba-3dd7-4064-b23a-99ee26ff4168.json and https://artists.proofprofile.net/proofs/artist/54d328ba-3dd7-4064-b23a-99ee26ff4168.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 0xfaafea81d7e3a9efd1372d0f317359735618f668dc5a81d481cef93feb054661. 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/AULI02353290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7fce85446485268fe92b1ba50017cac3b26169f54cec40cecfb9db6d5568ca. 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/AULI02245810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb9b9efd7d89fce660dedc2c586a06998ab1825b26b1a3f84f37834b8bfab68. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/AULI02354560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3f271fe2a6c09ec7aa2cc13fc40ec29020e6c7e69d981fed8c2e05fe549e23. 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/AULI02354580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b09d3503ced092bc5645c63ee63df3ce2ccb92968a02d43db20d983f5ce099. 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/AULI02248610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc223555011ce09f1c0cad13a9039eaa10a52dc03ac7ac9a3f8b9904f88c81090. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/AULI02354600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc91f5ba5f4221a85ed59a59ebe53ede8efe0dba21b4f873baaa6fecd8763502. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/AULI02138990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bdaa9f893ac168a4ea9d130b838ce9d955f99ebb7a99d0ea27fe3b8f406275. 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/AUMEV2538637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc519d079cc022d33da27f6992fbb0beb38a0b991962bd8cee4d00027dc086b4. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/AULI02354630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda21bfe2e8d57a45d7547c4d6fc456b6bac20e350b0e5cb2e0b84a1ae5bfb7d9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AULI02352410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7fce85446485268fe92b1ba50017cac3b26169f54cec40cecfb9db6d5568ca. 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/AULI02245810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd457889cb2a28e4cf49216370473f5ad6b3d00bc9b31ceccf27311c744f9277. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/AULI02144680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5607085353e1c8dc7e66d5a9804cb7c219ae9e9d2f882f59ca2857103351fabf. 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/AULI02143760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc91f5ba5f4221a85ed59a59ebe53ede8efe0dba21b4f873baaa6fecd8763502. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/AULI02138990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215f73976ab0f2a2066f60f8b64587d7a40be759d40e7f41821d06d3ea37d752. 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/AULI02032740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a783b30c4b0e767a99c869b970ba72d5d0fc1608578ef358e4f356ed2e590e4. 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/AULI01928780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3aba1d350b40946f0f093ac73863ad7d6d751fb8333ac9cf401e0e1a3c1aa0. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/AULI01925480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b53b9ab22c136b7e9aac2a9dc603143602b945c97394754dff762c852f386b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/AUI442200040.