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 0xc99a761ea4711eab59a1e6464212cca25ec80ccbc1c1dc077c87572f6e91ac68. 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/0a2731f3-a6a4-4c3d-92d6-423b4e53264a.json and https://artists.proofprofile.net/proofs/artist/0a2731f3-a6a4-4c3d-92d6-423b4e53264a.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 0xb3accf43721b19123fb60019378c6c98b5a48a88d79e691046d2e870129a6352. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CA2SB0500044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f1dc3353381b0b9825a245dffe3faeca2cfb7e86e4c848c0304706c2a23d86. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/CA2SB0500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca04fe3fbda666ee1f2a82183e124c633225a72903f2499478bd6bd6619d5de3. 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/CA2SB0821502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf217a31c8c9d0751eaa0b73763b5c7d6d50bed1d60caa16acadb757339adb23b. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/CA2SB0821505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6408a65f696949e3da2bf821df2ea106c4f28fa84e54abfc8b3c76fe0b1126c4. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CA2SB0821506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4ad8deea573b892014219bb7ec0ba659ea65aa5ef4f456c333b3e51dbbbc48. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CA2SB0821512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4589b707fb2c848c65644ee32ee19eb8de08d0a9fc925b8c72302c4da71d36cd. 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/CA2SB0312281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f6588b6493b6f17aa31e679296f15163789ff95ef0b804dbf9562e6ff38bae. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CA2SB0312282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503f11e0d96085427dddd34f11f6f232142c01a0b14af5b01bb85d3185d02653. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CA2SB0312288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840ec4689555d5635034d56f8c02c9652bc7619fadd5a81c5b504842fad959be. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CA2SB1506102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1441538d49826924e47a71a522f287fadc559ed1686bb7a1184fabfa08ac9347. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/CA2SB1506105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0268dde51c343a5b03b3ab49d101a34f0bdb782b2405847e0726e88b92be30d8. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/CA2SB1506109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ceac8e83a6b43c0819d9dfb95f81c0349f34182bc6e69f2cb0fac2bac05d6d0. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CASE11800035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21be7995f262766c5426c6cb1a8eb5a43120b14e20f47bde3da8c4e7236a2f2a. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/CASE11800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d34b1f6fa884646ea199dba9b3ff8ff72f3b804775e6ddbcd45eb7c0fa88042. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/CASE11800034.