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 0x675088a3382f84b2498779f6b3542aba6cc26e65d616c7d1a3be8d820b760ddd. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b178c923-903a-4d79-879f-524628c54334.json and https://artists.proofprofile.net/proofs/artist/b178c923-903a-4d79-879f-524628c54334.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 0xeb5a634250fd4e44a7518b1f648dc90ac9e34c90fc52926b02ca43968ac6a3e0. 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/AUBEC2494079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4c5d4d0a244d9156ca5a3277e67814ec155338c20a58d731c4027f722ae3e7. 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/AUBEC2433936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3f3e422ce9ade99accc92e98ee074e6e1313f9e0c14ca668689a3dec34ba76. 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/AUBEC2407217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff04a5fc208d60cac7d8c276f2bb6bb5427b4effe99de41b6f4c9d84f5871b26. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/AUBEC2324330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a3420d15439059b8ca01f1bd38502abe4ef579c436e627d004e54d4b4682a2. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/AUBEC2319811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c69181645ecc901aaabe130a3331a294ed12b5471339dc0a51857d6492dd79b. 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/QZWFV2466517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33a4f5be6014ced62e021a661d0d47ba9d1802854312806472721c5b6ba60bd. 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/QZWFV2466518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdea8b933611a05c6454b57beb4abbd9ed28d8ccb3481ed6a083f5df04c198b3. 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/QZWFV2466519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8117e40cd5c0084db859bf21c7fe01d5981c810196e8fffc3b6abd6faf39ab8d. 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/QZK6J2486682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a24f9c2fffb1db39411f8862f94d2a26d5f7f72f2630a9dbdea5c589eb3b0f1. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZK6J2486683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4422fb3f50965443a7482aa41702bada09271156ff4e3494bfa74ae00887447. 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/QZK6J2486684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a54550c17ec11cda2c480c5e983726e60da510ab20710a1d5723cd3cd10393. 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/QZK6J2486685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba67564b0266dfc70b528d7aa6a525f5267512c5e011471d97a70abda7ddd18. 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/AUBEC2520898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acfecaa71cbd8ddbc48105368f8991806bbbbdbc14a6fd6064e330257abcf50. 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/QZWFF2454319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445cfaed346cb00f05af6921f0a4b6ff5d32408a6fc641542c019cc7453bf6af. 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/QZWFF2454320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebc3a50b83cebd959cb881772520025ac5e697b0ad9f6fac098846872bd5b83. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZWFF2454321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96271adc9d046d691ad0857db8443019aeab4d62b8a011532efb8b5bc8548276. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZWFF2454322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6066ce63fff4bb297be16e12fb32a488996c1d3e03f9513373b8188ef231bf. 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/AUBEC2491045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b64c870b228cf8d35101b92d7f6d158529957076518a167b8258c012a71f4e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/AUBEC2491046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf768d5d52291d297b4a961c1531cd1d498a2b546b42806528a80b4b4b0afde46. 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/AUBEC2491047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d4b609d3ad8326419e16ece3250074a6b8468b718b4e39ead8fc86998ac528. 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/AUBEC2491048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf0b2b99fcf942e3c58a5e877f3a2854fab841beaa0e95a73e283c245c65aff. 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/QZMEP2410614.