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 0xb0c7421f0567f3b6793066eb2bc95c8541a17865042f2ff6946cf3a4a5ad96e7. 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/905674f4-ce8c-47fb-a08c-d339a71217af.json and https://artists.proofprofile.net/proofs/artist/905674f4-ce8c-47fb-a08c-d339a71217af.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 0x87247d0f38473be8434317f5c490d77814f976a45ee8de718196096e4786c09d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZGLS2079603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f4ba3e7a9a71f508ddb58636e88a90998be1a6e152b98360ec29cf8de929a2. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZGLS2079605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d02bb07ec44a8345269f3e23903d88b780d5f4f411496d0d1f317ca4761b29. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:10:15Z), 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/QZGLS2079611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e2b4909bf5016f66c891a67f2867687c4182cd4147eddbacff77859e228bc5. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZGLS2079558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a845cf3b698c19ce351e242d332db11bdb5afb7bc286f96c22f135ec8a31d3. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZGLS2079560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a71639f37432d5129c5bb80f67805faae5299f2dedad8837b1703fcd5248ee. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZGLS2079562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2762be63da900cf8b2abc05e8bc7b5d690af5298f69bb1f8e6f54f4a961d2d25. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZGLS2079563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686e620d4571992a586443619c929dfcaca20c2c5e584e162a0b9bbada614ecf. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZGLS2079564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e70bb98f98856a3727c0db5e67eff9c3697be97543251350dc55298422e957d. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZHZ51963091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cf438d39f7125d7d132f0672de516b94bbc26f7013b2063d323deb5a218bac. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHZ51963092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3bffd494a5fbb5bea2b167f295a998d31fc938945f484c5d1d6d5324bb5deff. 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/QZHZ51963093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc2297d279ac0751a53acbdade9536922b4ab18855078a50dffcaceac7cf7a2. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T08:23:13Z), 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/QZHZ51963094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5862f7a2f525ed9647dc450c4642d952168612be1e3029512488f8dda4360d9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHZ51963095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4afd0063b71d80a0c6ccf8af755f211bfe43e04786b1e145f55b7050712023c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHZ51963096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1005d8f3ccd1c47ed7baa16788d4181ac2d14b8e1fd5a9348417bfaa8c26e149. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/ES71G1833817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cb353c7246304a0207581eb0c9fec2e80dbb1b36539e84424f483b8f7d5956. 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/ES71G1833818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b3bf137e53db9ded17c1824055e7fae985a1fc672297951128d9ed5cee17b8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:44:45Z), 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/ES71G1833820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baf0dec2a8f8815261b4a6fdcb3b5b9556fc0670d457943365ef8f9a24fd7e6. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:52:29Z), 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/ES71G1833824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee64b42fb9bd7030296bd6ee2e2585267e9a7df867eb6095dbb86e8b1d1db53. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZHZ51958953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97674b153f2b008055a13da914be5f59355ecb4cfa0a30bc2c4bbcb794c50f1c. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZHZ51959058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00bdc525bcb8d746185a44d987fc4393d8ea5abb6ae2ff1ec78f88ecf8fec50c. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:19:31Z), 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/QZGLS2026673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7472eeec223e4efb002bbb58627c5920555bac714d7146830aacb9c6a660fc8. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/ES71G1828103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f8afe66162cd453f7ac87439512302e1b20c83069b31f07f9fcbe1b50044aa. 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/QZGLS2130069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912b929f416ed921f87ebe2695ba7e9fa6e4d5f83aa274333d43f1d6cf1eb6d3. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZNJV2111945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6bbcf6c6956a186c397947052b3fd17e5c7aa499980baa3b6f944595e45659. 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/ESA011995938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31882ae4aa09be86a6b9e8025030b6cd6e373cc8f2aef8ffb39592c2d7801b0b. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QM7282085017.