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 0x962a8a2f9eb6eb7c00753105b7bfe2d593cfd26a378ca642f3bbb2af5fc3daee. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e949d917-b689-4a00-942b-ac3b2ea400e9.json and https://artists.proofprofile.net/proofs/artist/e949d917-b689-4a00-942b-ac3b2ea400e9.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 0x98fb9e7eaec25287f905db0e4c9cf893885b4936e9ac1c20544b44e686376306. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZTAS2526458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f89d36bcef8cda7347807ce73eda9e19a5c2585624c9148a2d58a82599ac6b. 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/QZTAS2526488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d1759acd2aa550dd2f346f7a46defe57cb1a919deb4d0384eb8536ed3b4625. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZTAS2533313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4da7a432e2acee9fa3b8cafac28477856030606732df14a7f2e9f5553509e1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAS2526466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddcd67aeca0f27879391faf3b4302112b7ae18b454937985f628b908a36b4fb. 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/QZTAS2585996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53087065801deb8f660da69a62af15a208d3ce409f114a41e85eac8896a6b7cc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAS2577145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367e63174c5ca9e02ff1cfe6c54c4f4d8c46b1e7546be202acd2988436738f5e. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZTAS2579631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1998a40e957cc0e071d9f6ff0aeabbb176df6f03a6a8147eb0e32d2b69b7148. 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/QZTAT2515196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f549c46ba5ac070df56c03b959b3df69547468d6ffdd537ef2ab2103f5ba4d7. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZTAT2518318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0d2b209eb8a49c05aad92df879c0d754528aa719ba4d32200bfd10252bf087. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZTAT2509939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d93085305a0252c09b942e75c8fa351c7302c36ed7e9102953f214e9edfd43. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZTAT2573728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bf137e6800023cb9f0f6e5c7823123ba340ab868e52c55ccc100cb0fbb46b7. 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/QZTAT2538288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903ec32b1110e6fb641b1c7dc7d1639902e603c24e3c9c77d538f626ee462aa5. 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/QZTAX2559412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035184ef53d1bf951ac5f31689415143a4c1015031842b85e8685956cdc8cf6b. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWFW2546885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd2edcd6518a54b7dac493f5955d60a204f5060c143ca7edbcfe180248dc0fe. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFW2550798.