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 0x6340523fca9fd7a5b322191216ce9486967ebd6421c32753a81e4eb45e847504. 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/7977e1b5-5a84-4855-a029-243db1e06d07.json and https://artists.proofprofile.net/proofs/artist/7977e1b5-5a84-4855-a029-243db1e06d07.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 0x4c58b60795761b71648dd91da529adc7777641f1c981393dbdd5502725eaf0aa. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCAEC1988861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe976345283ec25771af99b59e4a3e55a01972d61df30c27ad65e2b92456a97ad. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/IL5841927490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a963b246ded017e42c9dd2cc2997d77b206443eaa9151a967253cd32928dcc. 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/IL5842030401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02db974deb6a09d081774a8b58dc741cdff92c215fbc37c181a4ba00ce5500bb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ILUM72200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac334c14654eaaa8c6b869e1f3824b5c1f7968294d45421a7f5354cdbc1e229. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ILUM72200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e962221e36a8ec503aed816b5775a098cb82e019ef2ebfd4a06be2aacd0ecd. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ILUM72200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36126a7efd4b2b8cd605eeb14f5c858c3666a899f6b6a5492e1923827e05858f. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/ILUM72200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c26999e339f2c9721dfe2353173b52554b98642bbddddee6031de3f7b67ac4. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/ILUM72300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a11449607f7d33d0ca6a6eea99e97b4e6db1aeb5b4f1f1042bd9f6fab0ef2a1. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/ILUM72300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5297672afb44dd37caba428c8a9f84cdf17907eca0dc424c47e023c41a70fc. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/IL5842550610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0774bd5a8e2452d29d0a343e562b763ad06b3923ee7fd71150b89ac65cdbc7. 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/IL5842550611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01fa4053040dae5abfaae0bdc3a2fd0e0ae8fd063a2533c63e5d4db5a4fd5e2. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/IL5842552043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e5abfc872521a2b982d6db995ed8d235461c00a511747b295335ec6e2905ef. 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/IL5842554237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964dbe07cb8a105cdad1fec7a20fda830fd4e6a49e9c64ae4063d5ad2e240973. 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/IL1022011335.