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 0xe3570b45afc2555c63c62f34410f0561d77d77a3b91a46497994141d0f38bc0b. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e8e2cee-887f-479b-a770-11c9242c7207.json and https://artists.proofprofile.net/proofs/artist/1e8e2cee-887f-479b-a770-11c9242c7207.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 0x94c4446efbd8ca5e86c2c3dcaa338e9dc539d906afbda1b22f4a2f8fbe5533c5. 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/GBKPL2028901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b266e964e9583b1377ed60fc92a9b7fecbf5d49eb5f174fab62bfb36438765. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBKPL2028902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90a554225df9ea00928337cbe30a7b40324c3dcd94ae1bdc7530ac07424bfed. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/GBKPL2028903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f4be4e867df24065bd5cea5dd2b8f66b7b3d4fb5e38cafa84a1681d7ab3efa. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBKPL2028904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42199c56c6fd47291cc1cb39e87484121504a1fc4cbb52774d494ae4f8df4953. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBKPL2019424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5274a47d7603342a77571927fab2cfad5c652f66dc3450fe73e36122900157. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GBKPL2028905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827efb6e689af8efcedf85748c99fc74d16968b0c9ce7ad5e737b8cecaf92431. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/GBKPL2028907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4efe1688b154d671ca29b5ed764ad2e9793d99f140030d028cee803aaa74c00. 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/AU2DY2300487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835901c7b534d329faa3a58468a5d8a91901f6bb791250ed7b5e1111ccac189b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/AU2DY2300603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ead3283db8d6b9d23d99a55ce92ba7f4800d25d94a54735bd0b7a0ff5c7f74. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/AU2DY2300604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d43cf0deb7c29f61ba427d1e0a42a79ce85b254a6c57e4359a30e84338a3cc. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/AU2DY2300605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a0ebf67c3c5066f0e37980da0d495fa25ecac96cec18c987baa8d0f6ff26bd. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/AU2DY2300606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996a17662fe27f8d3485c55a006657ef7bc3354e2868db4bb37a186bc86af4f9. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/AU2DY2300608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78df5b51a9999ccaf0859435ff9c06811a67ca2385fa442f00b7804a7fcf099b. 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/AUMEV2361899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78df5b51a9999ccaf0859435ff9c06811a67ca2385fa442f00b7804a7fcf099b. 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/AUMEV2361899.