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 0xa15fa5204fe0c8ce9ad8142f05eb777cf48fc86babeae38b9915cfb5d6aac5b5. 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/d9219da1-b09c-4127-9713-d07a2ee0fe42.json and https://artists.proofprofile.net/proofs/artist/d9219da1-b09c-4127-9713-d07a2ee0fe42.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 0xa57b2581527b701eec2f5e557b7bf9c1f93e3b43b631e202bc561cbbc9d3e397. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCJPK1903556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e2bb6a0a4aeb22a75a07178805865b97d99e010f5b13515bd8a19806dc257a. 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/TCJPP2105973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d96e0774946841b7c8909691b416fd08966dce248c0d8c0f19718d03c6a7aa. 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/TCJPQ2172922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42717cdef7afb87a5177d0eb37ae2b8f14ebe6f712a0d42fa79672d0633be971. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/TCJPR2266583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bc8faeb5959b279033b36e74df2ead84e6afcbad4e7339a6e2bb7dbbf1fd9e. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/TCJPZ2417755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a9ecbd6484ffc9d3362a1c220a73e1bf88542a9473dd6ab959f695742f3a52. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/TCJPA2413023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedbea73a8d4d3bee0e7cd35a1da85ffef3b73163df078339efdf67d1ca3f7f6. 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/TCJPA2484938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3972aa43a883480f710a6e96a8351051ed6686a2a527209c36694a50f048936. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCJPE2542364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc28db02fa13caa66783ebb73d14545b487c21b3520ab4bec95fc0284c7acf8. 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/TCJPE2542392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccbba82b2646240367a04a18efbded1cca5af630b17bdf88eaac59c1324948d. 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/TCJPE2542402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866cd69acc8339422629bc928c98f744485d3bb02c5da0c0097d408f1617d424. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCJPE2546335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384d449a824eb18f62e6c23adb20aefc65323ac35962f498c2c2e1453be5d81b. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCJPE2546341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3972aa43a883480f710a6e96a8351051ed6686a2a527209c36694a50f048936. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCJPE2542364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525d4b1d0d1e7f2ecf1f916b0c55c0c17e8bdab3b0366acb30c7f711252c73b7. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/TCJPE2542386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccbba82b2646240367a04a18efbded1cca5af630b17bdf88eaac59c1324948d. 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/TCJPE2542402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866cd69acc8339422629bc928c98f744485d3bb02c5da0c0097d408f1617d424. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCJPE2546335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384d449a824eb18f62e6c23adb20aefc65323ac35962f498c2c2e1453be5d81b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCJPE2546341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c6f7869bc2aec9690d7b55e582fd9dc439240ccd18847930c9e76a30ce6f8f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCJPU2214986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120f88e8e6fe78994e94e3228747bb1720adbf0f435f7eb368df37ce73db6f26. 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/JP92N2418892.