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 0x16a0636e5d4bc3f3fa2187ab41d104a3c4bd2b5f3957fe83c063c3c555cbf124. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bed07f10-0c82-4bd0-aa29-2f1965d46b88.json and https://artists.proofprofile.net/proofs/artist/bed07f10-0c82-4bd0-aa29-2f1965d46b88.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 0x6ea974c6db47ce755b8e62d93d1e24179752ee2e83c343ddea10a6529b148833. 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/TCAIV2411003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5660362624ab7c0f7a119c46e76a6064f6c33abcfb1045da1c1ab47942195870. 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/TCAIV2411018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13e5408d1ed8ae37ad497923d7d14d82df7607775961bad028adcb8f2d18506. 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/TCAIU2411036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c05919c65529f18afe78eec6c567265eacc45e766af3627097f04d1e911645b. 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/TCAIU2411052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756d67599c1d96ed93ebd4202a9cd8d9d7faa47d0a0effd1dd232b9266e8e691. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCAIU2411081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf893bf0ae2076086b0b3bee73a6f3a9e658306abfef56f10a03718e106d77c5b. 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/TCAIT2402418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75f5e71ad88bf6fe633457835896d0f7528d0ebbe97a30e0b350124e9fa0dea. 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/TCAIU2411108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6555532ef762f836bde1207dff464264ef8c94fa2923dffa2817c4df955c74e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ITIWE2301193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2bc48e52990aea9efcd4d9d11691e39d285990d8f1808e196a14187922996a. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ITIWE2301194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590275916903511f80aa87692e2184aa0e01162ef499bb0e4b883b984aab64e3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ITIWE2301196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7d08ec3341542caeb058a95c5410aff605d0469ffd2077788e3ac378e4a28a. 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/ITIWE2301198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ab1c17c6f06f21b56b77024ba29981e3407bd4d3cb2a9d0defa6cb48353fee. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ITIWE2301199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d4982a4fc57c3da219bc1c7c78929a07780c1459b8b2f3d67615a5e1c04461. 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/ITIWE2301201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb036f498ceb4f5b5466296a86f35589f88353d0e8ff378f07f206ae4e7a047c. 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/ITIWE2301202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6d360d3df2ed0f21bd7dc241bcc1eb5f5e1451cfd0d63dbf86da8d9df496a5. 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/ITLGE2500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a678f942ca35e4e272a919ca1599917779d9b5390563b0fd680bcf680e898e. 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/ITLGE2500059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf893bf0ae2076086b0b3bee73a6f3a9e658306abfef56f10a03718e106d77c5b. 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/TCAIT2402418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73990a05e24afd83e7b3acb1d6753a7f45a6f75bf6ee8e73d701dc3f708ad0ea. 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/ITIWE2400256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ad9077002b58ef4ff89e3fff568e3ee92fa19198f73d99ce73aa7f0d5c0921. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ITIWE2400257.