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 0x356089e71224dd00f6b965b8ca0725b55cc46c7f75852556c0f0a6f123f5c38e. 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/465f554a-9b46-46aa-b750-a5e362ab91cd.json and https://artists.proofprofile.net/proofs/artist/465f554a-9b46-46aa-b750-a5e362ab91cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Complete Decca Singles Vol. 1: 1935-1939
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 0x94bdfecf84386bf1d0dd6fac2063bd6141906e80bf243f89750f315bf62e36de. 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/USMC13661419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ecc14e61ca82eec0f55ada11738cf60b4938b785bd2868662418c204572847. 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/USMC13661422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79f8a1e79a9559311d42070365421e0a6a5dda4de1943e24982be1c53098b59. 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/USMC13661421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440d71a8972ce726bdf15f068a7bfd3b6418f3f840b54033e3b1ab3bb9b6a50a. 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/USMC13661420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb69bf5de0d017a8343a3bd3c23c29f30d550f483cf54588708fc0af770b623. 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/USMC13762214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79db1bdcd2bd8f0bfb9817785e41d1e66db6d62f1f276f640d97537dafc42cf4. 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/USMC13762215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e07a642f5f49b8fdc101a9eb48e895acb7349d9d7ec9054988ce1cd826234f. 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/USMC13762213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9beb9b81244b7084683fc0ce0a60a1892ac71c415210d5eebb885b55165cb582. 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/USUM71119997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1275dbf00a315d920e7b81b07ea79508dd99022bca0dac4a9d3470d005497b4a. 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/USMC13762896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d39a0e0d31ba443778aea03cc5d7c485ba7dbfae9b323e2da99c1863f953841. 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/USMC13762897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2124fd6bf2914f047090f558449be0652298db0899023b8e3c1ac61dff039e40. 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/USMC13863225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67521b81fa8f8e9af3ae6907e1b2609b8bff878d3d0d19101df82132e9c37e2. 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/USMC13863226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3805d5f9dda6656461b43ca3c17c5eff60dd798fd0f64fa41ecf046a3eee314d. 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/USMC13863703.
You Can't Be Mine (And Someone Else's, Too)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9b748bcdae0222a50915bb79d2cc31f431f6eb59348cd1355b4ba3d632b572. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USMC13863705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecebd8349a75d5eb20c77de794f3f7dc4b2828be9156a5f8a1eecbd890c9337. 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/USUM71308506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c1aee7ad7740dc647c0ca1eb28ee3dd108668500dff50ccc3384e949c2baf7. 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/USUM71119976.