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 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 0x52cd2d1b61b3c753d9ecc67d2accfc8d7ef07146a3f54998cf83194f86705ffe. 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/d4a8a420-79e0-4de2-b096-54b5df5e79e6.json and https://artists.proofprofile.net/proofs/artist/d4a8a420-79e0-4de2-b096-54b5df5e79e6.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 0x3b55b5486672b9125825818689cb0eae95f4abf8abfe236230915a4152b681db. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UST8K1829587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb02c2ffd79eafb9b2f26a371ca7020284cf5e422f8ba6974e98f661c84f2a3b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/UST8K1829588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a8f9b054aa77ecc6087ac4a49276a031957686ad4842208012d42e54414e80. 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/UST8K1829589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bc8a6dc6509caf9e5bad004a71a005da50f0f2f52fb2f628834c43bf3d6e64. 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/UST8K1829590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481a50bc967a881d4e3c12501446337fdb2082c71bd407298378540f45b4757a. 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/UST8K1829591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae74e03b55d08c494b1400b23f3828c4ae6863a4110f9de22b0d75be4e978de4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/UST8K1829592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff6debc284dc3b33d64323ccbc28ffd675b27b1168f0c10cf4d433a968fce82. 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/UST8K1829593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77885416538656d820304e96f1d649b0dbf37c73646ba7d3f54c0f3de9848f7e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/UST8K1829594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905d686d38ad89d8049d31c5877fa69b3011f913f0aa4418a031efaba99d4b65. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/UST8K1829595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eddb5e89a6f38b913c72e251096782bcebeaf2f8a335a44356027cb74f16930. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/UST8K1829002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d2226cc5b54ece2089a07b5826e6e950ec40ff963cd356493abfd73432fc38. 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/UST8K1829004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1cdb15c06e7df9f3a04d66149492ddb7b8ba4f91c5dffc8ea1b4cf083d6f1a1. 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/UST8K1829005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a3fb2c742287ea1cec2c985d8601f73f28319d6815f05a971f9648929bec3d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UST8K1829007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29da4a761a6d0f84dfb306ee628522fd9aa2180b6afc0d6a5f7546e71d8cb919. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/UST8K1829008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118bf7c613a3a138f2eb4ddc338bb3dda10f10aca87e8097825e07258b7992ca. 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/UST8K1829009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce33d4257528b36947a7b5992c71fbcb6cd0dfdf52c671f84041d9f689e198be. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/UST8K1817365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ccba285da0950c70b6e3cbede13fa66628e463f33c654fbb0f179d644fee08. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/UST8K1817366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf199007ff3aac60d56be4dc041c4ee9d306acf0e5f6e50d067e29d31385c6354. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/UST8K1817367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e539a8dddee66e4f80de1e8eb3898ba197a1f646ff0f9c7f504f2386cd1e31. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/UST8K1817370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe229329bf49ffbf9254095326b39cf6077e00aef3a38dfe260c44fc76fe3fef7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/UST8K1829574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd44f8398e702c3dacabddd1fce1e3e1f842910196a58c28b9ad7b38581fbb7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/UST8K1829575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf427063e97d32101c1dfc7b4e452922121527ff82e3ed5efcce4e5351f828d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UST8K1829576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd9ad269eeac3ecafe9c8f36a84788abb807af5c6db0b39cbeb23804aae14e8. 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/USVIC9909810.