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 0x5d805d95035ee9b62f25d5d8785f6fffe93b7d617d59855d8e89944573fe565f. 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/cb07e513-e23d-45f0-b4c0-bbf9b136a8f8.json and https://artists.proofprofile.net/proofs/artist/cb07e513-e23d-45f0-b4c0-bbf9b136a8f8.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 0x1b511d7a079188a41ad56bcdd7209316358c1d7bbfbc0b0dd326bb5bfcbc8a1b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWW2170285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a41d1dd579cc8a3d769cb109b8ed840fb3f6348fedff412bf5299078d0a0ae. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWW2170286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f625c60654d495592a6f1824e0dded2386c00c269dc5672b54a88c1ade7581. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWW2170291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf05ed6764a2140c4ebeadec75c4be70a077f6fa756479ba1cd6d057e4ba82e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWW2170292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a53d0496365350e7f7ce8f23fdbb37008e578b6dc24056cfb818ca678bb1614. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWW2170293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6cbfe2f521cd1876043ae7ef0e58f0654208f97a97cfb80059749bca039305. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWW2170294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9436dba277520e50599062b6d39a327fbfbc503c0ae9da76b38a4e727173488. 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/QZK6M2258180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0efe78208c66dfdc5b6fbdcecdce4bb47e39a1b39ff9b2240728fe8643120a. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZK6M2258182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3d4fd71de8b07465a01c71684b6ccf8c36e3dccbbd54950076c1984e4d107b. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZK6M2258184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b461208bd09fa4da77a9ebad26d3db88f57c3a616bea440e7c365c7de9df17. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZK6M2258185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72f5887a5856a54580deeac530e5e5f6519624c2bcdc5181ab7a08819045d13. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA72266839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a7e661346a69da2abe7fbc1a144c2478aa8c061dc9edb4211351025cf3bf07. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMDA72266844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab84ce1952b88ffdc5d4aac4a5af0f723e8b53e76a41a2c9163d38811c0594fb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA72266855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa938dedf7d82d7249d0064f89a8dad3f218f4c44bde0ba11dd861b768c0946. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA72266852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5cacec881cf097af1c271329d4c39708996309606d44b6e0d3ea4623974d0e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMDA72267626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de987a9489970f5b1e973a954fb81164e086bdbc9999322d340356b659b11ed. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMDA62268996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4910df3a642413c81163fd3b7a937b7cd697c9e9f3ddc2fe841d24e6c6aeb5d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMDA72267749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2e8632770fce127b1effd9fe8fa07a7bfee0b958fa2e2b2d738fd8365f66ad. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMDA72267781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce108475dd87270674fab36c1ad09ba5c770171240b5fb5fe3044093a219fe1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM7282393400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51c356d4d2210ac34fd298bdf43f1d05d79305c2522ded64bc42d5c182d49d7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM7282393425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef692f36b1c7ba3356917c79d6100d79b65b1d8bedbc1de97cf5ab8fb8cb709e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM7282393451.