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 0xa3de129887fcec64b039c263033c11591ce1eab71d59ad1948a62798e87c9088. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/31977ef3-020c-4e33-9276-ad6db706df4a.json and https://artists.proofprofile.net/proofs/artist/31977ef3-020c-4e33-9276-ad6db706df4a.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 0x2e7196e67aa4e75ac476f4ca6cd62f9fa36ea1dc802f557ec3d226368ce31b23. 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/USX5G0316601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd874c7ac8416f5575586caa896029e38a7d8db265a68697434817c8af96a89f. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USX5G0316602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89aa2f5315d7311619a440929926a2985e1cacd7e9337a913bd2957d7be9c0c9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USX5G0316603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5ad72945876856b154f6a578e8a34a60aa80dbc32093f0bebc5a3fecf1d401. 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/USX5G0316604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88563361526db5f74043064bda094fdc66900e803a599ed273b5b27d4514acea. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USX5G0316605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ded16a60d405f1d7536b4070582fc77c1fc6dedd88838c535fad282ccef8c72. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USX5G0316606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e85b9cb28248ef45cd2bcfff0a2c39cfd621bda14a5f44a26e869dcb3ffc370. 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/USX5G0316607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641a77e660058e901962a3f766a916a06e47bc41acd3678acbaf7d41427235a7. 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/USX5G0316608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4982c23b0291dbb9e6f46d8c714eed35e380587aebece0910677b0a9c8a08eab. 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/USX5G0316609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9e794a23d7cbf91b6c45bc11b14b26c3e0f45ea8f255b5c2cfb47b6cdd68ea. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USX5G0316610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fba53c663188bc9827aeacf9e3124b96c9bf5c1650f59b995e15eb2ccb9df2d. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USX5G0316611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04627b545b3f750a9138c364fcf1b8bd73b1c6dd7ceba0d9a0e5c77e08bbed20. 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/USX5G0316701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b311b94fb1128c674234e3a941d5977670c3687278f67ff132febc1feae8ee. 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/USX5G0316702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3ee6f6166d0916a750aa94f1638b990fefb071c4422a34934b6928e3e7b3d9. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USX5G0316703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa576f5013994d6a64ebb091dbc4bdca1bf5fef2d7a3bd6200adc90be1cf89f73. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USX5G0316704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5b7126e0595bbd58dc6852aed428b50310220b19964c46d07dc5c0f0dd0172. 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/USX5G0316705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1b80e70d1979cb3f89b60dc74e0bd110ebaf201c44cc479c284a3f3b983a61. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/USX5G0316706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b08376cb86167d4c94aef5d0919d0ecccf27856766c9e51b95081d891ef88ae. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USX5G0316707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f596ea414ae535b3ccd3165c198e7e6eed36c381c252c79c7576be9a7c29b3. 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/USX5G0316708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47795bde7fd15b86ff706078ddd23eb408087f586e97296172c0ab8f38c9292. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/USX5G0316709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf365f73d1b070da5207d7deabe0125fb96143b763ee9bb4f7c331e67f4d3f422. 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/USX5G0316710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd90891929ab58ce726d41adf72d847796cdb5ac74d1126905747b9dd9a0088. 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/USX5G0316711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd1ae37650965c1b3d64430f62e2a9069649ded0270a6f3316822dfc06ec105. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USX5G0316712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fab467418b950045936d1a12d9f074d7b2ea2cd1cc2746ee048b4bda4cacb9. 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/USX5G0316713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570a854fd3f6657ca33f62c091dd0369654d0eddbc48291b4eb265d5abbee5af. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USX9P1127385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecfa2d8d8665dd3a824ebd73db5ea53c6ebdd46824ce0c5d940be590515c275. 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/USX9P1127390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77de8102ab06cae43d2f7cebf9ff271892d6bdafa5ba8701a76e26c02fda0f45. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USX9P1127398.