thumb|A threatening note that was left in the mailbox of Holyoke, Massachusetts Mayor Edwin A. Seibel in 1955. A death threat is a threat, often made anonymously, by one person or a group of people to
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43f47f2c8b0726e2a0bbbea0e7c0b0c39a85156b0d9b1cce016a9085a47f9e7. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c02871a-edb8-4f47-8615-d3d5e891b24e.json and https://artists.proofprofile.net/proofs/artist/9c02871a-edb8-4f47-8615-d3d5e891b24e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8a3aa9405f3547ae07dde39995aecd32b89517ae1b2f71a1e2551648244e1b. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/PHV031010603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ce0b25953ef54eee4c93487685830c648db12308e3c7b8aad1e2919c55b026. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/PHV031010606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6662fcffa20720201d766aca56d5c55a71474a67bb362bfdba85c4667d1d0745. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/PHV031010373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fa088063cbc34c6aee0a76261808944aa64f8716beeba757552d021e6c61d9. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/PHV031010371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1430e63f5d1a40bd55356aed0498b4fe881dd1b5fda79e295580ffb427270bc2. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/PHV031010611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973aebcc9d9ffe3276ba9324b8874cb396bb8384a05e55c6a35cc31d3243799c. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USHM20572925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3560575a730688e4a53132ce8129050750bd803737c8a0487b8b14f9f8dda535. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:07:53Z), 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/USHM20572930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb695514afd35e213610725f463d64955d40e343ff33c8e4f5f787911f5cb4e7. 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/PHV031010602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f6c631d3b93b37630a8c15318a438529ccb44e8cf432162f64230275f09323. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PHV031010604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c2f60647e8b970da43cc029aa19edcd0911f54c9bf8677f71548446d0890a5. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:25:48Z), 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/PHV031010608.
The Worldwide Tribute to the Real Oi, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437635e4ba220cc1fe0c9147ac8ec73ea2e5094ef802a79ce1f11fc066cb8895. 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/BEZ100200200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da8a8de49fe285eabb9bb405933878326124b8d94bdeae68db021ed6d88307c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BEZ100200340.
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