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 0x17985af4a92200840d03c600e69e0f216d7a2332792d7247191af179d8a3f1ab. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/857a89ee-2344-42b8-94bd-4c208f1bf90c.json and https://artists.proofprofile.net/proofs/artist/857a89ee-2344-42b8-94bd-4c208f1bf90c.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 0x8e819bc3601c14c5e924319fc2797da55fbb445d4c258a7b6af2a8c94adb07cd. 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/TWA471299001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a16ada7ae8bf587674d1a45f2af706e5732de0525edbdbde9a2e15128e04716. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TWA471299002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbab3a879fed7af2ffb981a4c3342d3013090dfa8ec400f29414ec538ab27936. 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/TWA471299003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6527dedb24936f6b93dc58f6d16f207099420c51e1e64034fd6851cfe9c2cc87. 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/TWA471299004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f24c36ddd1d027a295c8f50b22a9c5f1dc5cd38c9cc917caea618e95e42b1e1. 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/TWA471299006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8fee3d12834eb40f5447b98fbfc52e8be2a9cc768aede9c82a2857bf5e32fa. 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/TWA471299007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568ed03c36c66bae7ec25039bd07c141ec8e2b293aa6377c51d0ee66fbd88aa1. 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/TWA471299010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60278edf69719cd67edd9cea8b1c99f3cc959dfd32184e7d593252b218bbfc68. 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/TWC230708202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2b7a34c1a3adf8b32a4983ba0e3b68326fe0bc9e550b656fdc8a8cdf608aa3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWC230708203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3ba268868de9ed29c8e75624882356107d41f4e16b1b33c55d3acb4bd8dce3. 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/TWC230708209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7845c51090220a0e39f7682ed4c9cf932af243446f4c3446ca5a559361bac7c5. 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/TWC230508101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5cdb85b85605c3dfbdcc8f93f53960147682c514e04e4f88b657f6530d913b. 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/TWC230508102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3836de890f942c76ddcaa09faadaa3d369c1bb6d26b5aff989cbb4684e30ac0a. 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/TWC230508103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b8d87a9d8ef462f9918c7242ed2ead5e1a5ecc29a0abc9fe1a8c189e46015f. 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/TWC230508104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ced58cfaff7a53d1633282435a0368da9e52400248497d2463c8a55bde00d12. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/TWC230508105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28254f0d5ec4dc25bb1af882e1d3f7ebc8d42155a2d5bcc447b4d9e71fbf7e84. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TWC230508106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc335a01cabf362dcffad560149eb2dfd2109c73cf9535036b148afcca0497c60. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TWC230508107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f925c80b64e158f4ff5bae340d0388937fd0ce11fd4af4bfc214d5c77adee26. 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/TWC230508108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69b5a963bb493b7cd347981c9b8a32d845382944778a2180713a55b5edf715f. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TWC230508109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f4719005303f5bb4d4fda162ac9cb77af106e0e06d0932fa471c583c610b2e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWC230508110.