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 0x1da744fb433b1eb12f83dfc609e5ecb795b0d93f4068bb566fd3ebc051658f4f. 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/911ea89c-8bbd-4e51-b820-569b40dc5c18.json and https://artists.proofprofile.net/proofs/artist/911ea89c-8bbd-4e51-b820-569b40dc5c18.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 0x7a4cf206372ef699116344973ef46a3fe775889116b819eb67b9868229a91d68. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NOCEM2047010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb58ebf6c64dcdc08eb31228de904e4f00c3f34817807c32536d4a0f0b38ca25. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/NOCEM2047030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a237ee2b3675a4ccc0df882fe3bd9b16db3de7644a847796f19c562596b1ea2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NOCEM2047050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd18817f45afcfde8f3ae58b6c1fa694a45ab0cb6c3756a73ed3f02ae284485. 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/NOCEM2047070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896ce52075dd4a42a2ab95078d03c7243c35510029d7d4293825c4fd6aad59b8. 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/NOCEM2047090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a4a74aa3fb28da62c3e909a25b3e1f3a6943cc17563427d3fff83cb5bf1ea0. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/NOCEM2047100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d4ffb1c6cfe6229d1d394f0681868d68a93f22f3cafab3555c4e3ba638ca06. 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/NOCEM2047110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef657885bf2aef471553a62eac6b53ab04275f8097300fbbebb1dd06da47b5a. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/NOCEM2047120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02dc6c20ae9bc85c266663ec0cc2011d8dfa7d0ea425a3c34fd09d2475a92a1d. 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/NOCEM2430010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aba15cf7092f033d672b2a0304a8bbcc89da55323910d70987ff6a168c7f7a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/NOCEM2435010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f96779c3b72e4e88c8196f7342555daf1aae19f2d9f9d9196fa1d58f96be1f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/NOCEM2504010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f96779c3b72e4e88c8196f7342555daf1aae19f2d9f9d9196fa1d58f96be1f. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/NOCEM2504010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214163944e7a881ad03e2f180ce6840cc186734bc5937d81db3e284e26eeb827. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NOCEM2420010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634efb95e3904423477d6515560474cd6b4a173aaf849bcfd5cca0e9bd0b35d1. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NOCEM2451010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba0d38c65decc18958540e49f3a678cd47e72a591c05c35f2012403fdf1612d. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/NOCEM2585050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02dc6c20ae9bc85c266663ec0cc2011d8dfa7d0ea425a3c34fd09d2475a92a1d. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/NOCEM2430010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7c8a6a2fdac5d917e89a3ad30b9aefb848c8bfb848799f837438aab06e7359. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NOCEM2585090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c7af1dd84995514b6457e9528b5dfdd81d6ac8822daa8a3101716c17cadeda. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/NOCEM2585100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db207767c8b91ae8af74fb088aa63daf5194e139cf6da83b7c6dc379109779f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NOJRA0715090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ae0b1d216e26a96a3d8a69c47a57543d7bdc521397572621c5758357995924. 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/NOHEK1319020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ae0b1d216e26a96a3d8a69c47a57543d7bdc521397572621c5758357995924. 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/NOHEK1319020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fd255c39b51a4855bc175b07acdf7b2adc76ecf2170852362c5210d9a9bf4e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFYX2280304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c88ad92580cc36b8f0628d3c020dd7e9d1fc55d29d27e9ec0848753a821e5e. 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/NOUM71101941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ae0b1d216e26a96a3d8a69c47a57543d7bdc521397572621c5758357995924. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NOHEK1319020.