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 0x7fc2c1935cd7bee2a793017b85d9218422e12a3d52295324cf68fe0780c26e4c. 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/f82c4f1e-4745-4c41-898d-d7330956be55.json and https://artists.proofprofile.net/proofs/artist/f82c4f1e-4745-4c41-898d-d7330956be55.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 0xaee6b8f6a8f870d5c60615c5adcb1403b8d3f68df347ca2047c2b239fe7ff175. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEQ121855088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39458abbbb11c867c7af3497cf58c6be0db04f2b8d1d61a76898461f6bf205e5. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/DEQ121855095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661b2af9381716a248dd71ff5fe0c8457c6e1683f0ec0eb1fe0c7a5d34031286. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEQ021801766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab3b44f36e89c8b19c82d1a777ca9e4757f63797b310af4cf276bd591409457. 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/DEQ021801772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0deafae395a01f2ed81272499999179428f5b0cef6952071cca1ddae7dfba967. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEQ021801774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8860ab956022fdcb8fdb96a5bc571bc201d0b0f5ece2d05bdc4435cdb13a0477. 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/DEQ121855204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c0b012a998f6dac41392c21eaa302a36d667adc5d8cf883667e2d133810733. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEQ121855205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e57f441075c7d55fa86a6c16dc1498fa13877ad09400ddd4d4e218c25a50a04. 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/DEQ121855206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18d4cdb9ec160cfbd36cf988b89266d7aa7f0e7fb3137c838e74d7cd250a524. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEQ121855207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73d287c5f4d8a995ede4503c267c73caaca5ceaced6e805ddebb93e598e3381. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEQ121855208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd636caced24519e9ca20fd5eb92177e104445c63f71c1cbb8d52b9f7904bf591. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEQ121855209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03eefe4dc31bc280623a012bbe46a1199491a8a3672f3200ed26c3b9c6ac1b05. 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/DEQ121855210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2f1cfe1b2a408b3a1a24e359e3693dcccd1bff52b22734f078783b29bf1329. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEQ121855211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157e14884a2adf11f8c9f45fe8353d57ac72c863045cedd4276a49e01869b630. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DEQ121855213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b99b1e4da739feca33a84e4b5fe62045fe841d327e3bee6192489824bb6aa6. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/DEQ121855214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56138e9e6fafce21f08b15a86c29c138b7a4a2b330a44b1210d2b2a1c4e2f69e. 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/DEQ121855215.