3+2 may refer to: Three Plus Two, a 1963 film 3+2 (band), a Belarusian band
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 0x685615ebc4239e31e696058df1bb27d1bfb02ee2f2151806501d7ecbe7f0f75b. 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/41e984b2-7b00-4c54-b555-e3509894ca1b.json and https://artists.proofprofile.net/proofs/artist/41e984b2-7b00-4c54-b555-e3509894ca1b.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 0xdc1234524bafd27719133c4504600b0924dddf4b87ff3ff55256c5c4c4e11a7a. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ES6010400274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15082e4e9375003b8358d0b45e944952ee0283b43c8b6f6c6aef2d9b692db26. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/ES6010400275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e78e9147f3483c9b6c309d5eedd777118b7727d9a35f4f0818a618d1610b36d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/ES6010400276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36965dfcecef3df1050b9fff2549d788cac0de8262928a7f48e60039e107ea6. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/ES6010400277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9be20c49a588abd3a513a0f0f6e26c47bd2f596b197785e853f623b601167b. 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/ES6010400278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9c142d762e4012e5f3b171cfc83e96be475045480dd7788e9d741a90d7d65a. 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/ES6010400279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba8b11d87c7e2f8677b45e4994519790de9783ce95d27712bdd069daa1eb73a. 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/ES6010500211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ccc7d74520ad735adff1e23f58e9a64284bdfdad073905ad74abb92c3bdf62. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/ES6010500213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7cc8319b3334d213b2c34e61aa4cfb657bdf98f337c1b5a204f7927f1f183a. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/ES6010500220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0f01fee8d9430f660854362a3cb3c2b52fbb836da1f6acfb9e93296a186b21. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ES6010500217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7930e66c98d81ca9632ce77847eef3ba661e41cf80d5cecb09ba7b42b5dabd26. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/ES6010500214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a5eaa7ea3fe0842ef5db9af2784df6991fef3424019c69719adeda88e96dab. 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/ES6010500216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430462af34c4ea4d3f1224089ea32cba37e4ac493acd3d4ff89d2aea7e7d075a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES6010500212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57548117176f87e4f00bc948e6a18970bddf854dc6cd35359973164ed6dcd375. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES6010600256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7364a4d8b5f0a800227ecd726a8e46e0c780394426c98f6649d5476e96cc5749. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES6010600257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c03dca3fd38b74958695a5401cf71799e4347fdc57a2b34aa6a3313f9284f54. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ES6010600259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8d627530bcdedc4cf63c28ea79d8cd42328376266fd310953a4754543a282b. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/ES6010600260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb789ea942a43f3794a143c8a0b7b7d528db6526d0116eb8a2d9d4cf15396c360. 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/ES6010600261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa87ccea14eaacc822ea5ed79c16f0342b3374ca9b1866b276a5d806a3ac3e0. 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/ES6010600263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823558eb4c07302ccc85e05395dd9a58456502daaee6de0d7e5cfbc156cf1069. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ES6010600264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224ea447929a2b8ddc7b231283e6b75662fec6b67a1d9031a89b674fb1ba1d8b. 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/ES6010600265.