thumb| Coastal lagoons fronted by barrier spits typically have entrances that migrate over time. Here, the entrance has been fixed by jetty construction. Carlsbad, California, April 1998. thumb|Aerial
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 0x5cba746f1bcfb7c8608762ae23196c130d777bb79cc76867c80baa2b8561b3f0. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7063ac5c-ce61-4aee-b01c-c239d222d7cc.json and https://artists.proofprofile.net/proofs/artist/7063ac5c-ce61-4aee-b01c-c239d222d7cc.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 0x853eaa4e8df8fc0c1e737e5e8aa19cc1f0653efc534b809276057d735e34f38d. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM6N22561911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2785f1d0245ecd90de6755ee70a4d3186617a289fad60e35f4ec3cd370d74ff0. 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/QM6N22561903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fb85c607cb5d8065f2028158bb79044e035e4d03ea3003d80ada587d347f04. 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/QM6N22561910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8624ca8cfb0cf502b304ce9524a19be9a4e6e0858ec4fa595dc4f45fa2dfbd69. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6N22561914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7eebbd5f1bd46207b9388c446c1f1022a64d72ac7793c5b77914e753a6773c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QM6MZ2549158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae32bed124ceaab5173add47423ab7bfd9d1ca3ccaec6330e2e5a1207ed5fc62. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM6N22561917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eadc80a13856f172d4d61e9403b24e0650afb6a9786bc668db1d6069f8c50cb. 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/QZWFR2580924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e12f000f35c0aa5e24e09e10fd1fa99a7b17e12196fd994bd4d44a8916a0537. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFR2580925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a36083ac8f61a11ce877e6927b7a074cf765cabeb55f38703c53cfd6440922. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZWFR2580926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ce7df2bf53019bc2aefe47360232536af233d05d6b07f0d51357f29874cf08. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZWFR2580927.