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 0xf5c56c97334630b2e1b5c0054774f167f93ace8ea352ffe6eafa3c4a727e5736. 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/602560ca-4538-4223-a9c3-29373277b528.json and https://artists.proofprofile.net/proofs/artist/602560ca-4538-4223-a9c3-29373277b528.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 0x7c2db9c8f27d0869b22a588553e71f80c298140637ea6d24109a617c3a5ec4ba. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZTBE2429712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0ce5597cec92cf7e53882bbcb386b1b612b4ab5ad0f2d8d2206691b5db378e. 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/QZTBE2429713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805f0fda28ead97d590f15c274f6f751e982a2c3d5216bb0d30a5665ad011bf6. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZTBE2429714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24ff4347ca3345753a7a8c1c8bbd4323d7711b265edb2e78aeac89a186bc853. 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/QZTBE2429715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf8d14415c44729cd8384c5c0ff3535af861a0409d4b8fe88cfeb1847d97407. 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/QZTBE2429717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7566ec2f9593b83cade407756c7e69584480e898b6d95619b3a58b363bcb063. 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/QZTBE2429722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17633851f3cbb6d6cbe0a7c8b59bed54f7c94259dc74df415e7b8e84e2ff028e. 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/USATJ1205501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef3cf7c1afefca4da9845c8cecc7d0207f620604554cca1c0ad48792fa850b1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USATJ1205502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91dc3c69e1db1d67f3507e52dfd26eca1bc02f801c0f4c3d7238b94c1832e1e. 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/USATJ1205503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ade82fbe98241948814efe4aecd82e3c70690de954e143be5eb1969cdc55d2. 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/USATJ1205504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6751eceda6e8eb91ca2dc06a3df2e8536e996f4ab9e91d894d65f92aeb4b7f6c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USATJ1205505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4c9956c441220a72c3908eeca2d8872778effb5f24b7652771574dda71ab92. 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/USATJ1205506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef44f58739b08a9933beaa5dd2721bb8d726b0b31eadc5722abbb2e58e12569. 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/USATJ1205507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da966bb32fba69b1730163b41870366d2af8b82de51408b2207e9bc38ba618c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USATJ1205508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e17a5e6c96d339f1601d90cc85736007503b207ce865cb156ca3fbb68ad4ad. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USATJ1205509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3639af6960a61b165266816ef71ba03bf4cf806945553fca3e3d0dcdfd4a578a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USATJ1205510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d7d4d2ea2641c73c7d7e42fbe1b197f48376c31552c92660a79e4dd4051c79. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/NLG661400385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4eb62af9b752d0fc1006d399e3a8f0ff2c7c08dbd38ec2889844775f19de82. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLG661400386.