3R or three Rs may refer to: The three Rs, the basic elements of a primary school curriculum: reading, 'riting (writing), and 'rithmetic (arithmetic) The three Rs, the waste management hierarchy: re
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 0x0efc5da81ccfce4a2b2bc5813a907df58b6a2cd09eb40b3ac2c171a7f94327ee. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bfbf05ba-6afa-4b73-b04e-ee3f021b7dc0.json and https://artists.proofprofile.net/proofs/artist/bfbf05ba-6afa-4b73-b04e-ee3f021b7dc0.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 0xa8cda13ad7edcaca1e59f88e905213ccd5b6e08257363fded5f34b2f15bd56a5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZNWW2061315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7501f4471e34ca3a840690a8f5778227aec899c9ab1539e1fa4a06efc8789f. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZTAW2334388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a6492a493434077803922e5be65d184e6ddf63e80ec7ccd64d534504f9f205. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZES71938559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375574a283c90601f1f31b50a3e78f25cd6df581fc820f28f1ff02a428f12a0d. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZES71938561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85faa739bde6dbc721c58653143a396b2a594f427a85c0d11e0098b548f7e2d. 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/QZSYP2356632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cc23a4d5eadbe087b2131d412ed1d6e72aa8c514ad93b277c464d7aa8a3e7c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZMEQ2202260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5516db5ae462ee6db5467b03b11951b22ecbb081988f8972503805aa1b20cb5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZMEQ2202261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b85ffddf4db18a9c770c013d95601b329f49effbf92f7172cbbddc09dc8146a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZMEQ2202263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08360a2b0ce7adbfc5a65548cc21ff2040dc410ab77216907001fee9e7c24402. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZMEQ2202264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3b97d178ad42ee23ce8316779683d5540e2309d05264b4fedcef9b203e16df. 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/QZHN52219274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658d6535524baca34f4641d047eced97cf77646ef27e125a4be69e4624763683. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFZ72284038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d43e1ed3870b902261629fd464c5a560b453c569d4836deacd035dc2b7d774c. 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/QZMEM2110406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6227808260ebfa14178285e8630a2a3f1590d5b8d97aba115eab2e8dccd42dcd. 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/QZHN52284085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a4a5c09953f2c5216464f0164b6043d7ccdc9b22a1196f10ea5c0d711e524f. 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/QZK6H2078182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ef34112de7de145afb1521a49fe94b29d2c31636f546193642543918b6ea5d. 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/QM4TX2041026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e4afd9c32f70a4adf2d97cf8db3e2b1353044681489bfe168acfd4ebc1368e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZFYX2006221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27351589c20212ef0048770091c4e5de969db1e3fd9a932fd89d675df33d77b1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM22097039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdeb293a9086a2b8aad4dd8bc21a615f401e3702a6cacfe7ad23893a09adb1d3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZ5FN2232695.