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 0x604f9e7479e1ca84d561da913e8f1132edb77887d31aa683dae572d4493b8efa. 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/64f9d97b-62f2-446d-a2fc-cdaa9e412498.json and https://artists.proofprofile.net/proofs/artist/64f9d97b-62f2-446d-a2fc-cdaa9e412498.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 0x180a0d344d35bb39578fa9238cb2ca6c062cd9e21cb7b94fdb3f84be323c5d6f. 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/QZNJV2455455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf020fd814428ba7d9238260df53b8350fe4e343632fedb7c3fd25404066a7c6d. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZGLS2493724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e9dfdf129666ab4cbb2e698edcd390734ef9f5e03da155b7b20df796b04435. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZGLM2410805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344df23090722c4adcc723df470b87199c4d7c49fe8887bca35f0819f66958e2. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US7VG2431509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f9e6d558e71b71d7fdb2d1d759e512a1091055784beacd9a0aca9f46a56a0e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNJW2372564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce48b0066d9c9a855bb44afad838cdd56927c6b443ca5024c6dc9194d8b2f231. 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/US7VG2366084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3599cecb5de3ac9a3b960077ab4d7bdc1f7ea1af71358d558da344f7ce146869. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZW9N2238157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafab0badb7f87d97684b0b733ccf537f5c143bc66ee811d0b12b86a51e56691b. 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/QZTVM2247540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd87ea028a6a324527dd0ca14644ee852f470546b56ba6173b5ded51561147d. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZW9K2244452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae8521f67dd414a6381d994358481fc7cfba7fd5caf6f4ef64d9267582bbfe0. 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/QZTPX2283709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27aa4d9255d4feb0327c03c5cf95559a3d2c8b4277c6064cef471597fa8b96d. 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/QZHZ42285869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921b8c791fb210eb0cb9625bee37667a8155c48b5073d1bfc2f71c700fcbd6ee. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHZ42269888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d6728160ed7f76004a76324e429043e153e8c9db9ca20f67e17048ff4d8aff. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZGLM2269529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1bfd82703846a7dd3fa361e93c39e0dcdf085dc538a5bdac62da828d4d672a. 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/QZTVM2104078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc64603f9c2b9dd5ecea9bc30da018f848b809dba11a8e87bd95b2e17ce87fa. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US7VG2217928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8d32895f951838908dc7eebedc55a78049dab2e23a34cb413ab96c15fb555e. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZTPX2196960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40dc473f27c7f21461df563b80e96fef60c3e6ec6b675d8dc9aff6c1251efa8d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFC2041682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92ec1225daaa2ede708725312e7238dfa8d0f236ad3443c6d6fba686417759d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFC2041564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427731cf99d5b1b069056197760624d0dbc2eaaaf71c4fad93756913d8e466e9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAFB2063078.