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 0xce25305a53895ff76368d562ff89d11deeb80f1fe5b38790798578dfea1fd495. 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/3e9fc62a-cb90-4be3-b788-f42bf9f1fce8.json and https://artists.proofprofile.net/proofs/artist/3e9fc62a-cb90-4be3-b788-f42bf9f1fce8.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 0x047fc834c790e811e91829d288a2515d40b47a498e2932d80d62891e52694eba. 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/HUMAG2008117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975bbe790a8fd513b0f75687c455cd2bfcd3333feb80f7ce0facdb29dfdb576c. 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/HUA320800442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd35b11fbdb4f4f681e6adc0ce5c7096f044542c53dfc1d179a7d9fc76b507c5. 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/HUMAG2010178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2854364874ded7b7a3ba4b24cd37dffedc722f830e0e01d13c20c6368b40fba8. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:02:08Z), 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/HUMAG2010181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5477711ee13166c71b1d77cc9b769f2cfc20e4edb2fac4ccede1526670cf73. 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/HUMAG2007095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cc25d48a6335e5c09e97ab0e42b9dd86f35a5605d5abd6060fdc253e9fca7b. 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/HUMAG2007230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b7626680a1a53b443a6a96d432648e4b45053c4ada02d5b64f365dfc7da18e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUMAG2007234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935879592475226fb5b99be71405c919f0d7ebc08ce96683b628433d6c57b73b. 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/HUMAG2007239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05a30a5e45b8d2825aefe1e61b2ddc097b48ab0f711dfd60858245d0de2eabd. 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/HUMAG2007243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1176bf398aa957f167318039fa68b793ba46478269dd7e86d9964d4c5d18a4d. 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/HUMAG2009372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35289cb54e14799ebc6f0603567f17cebfd4daf0f7b6dbe4310a931ac7cd6fe1. 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/HUMAG2009370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e187e7efc733f869ac10716599600be2cc3cc12465431bfcb3ecf56e938fa5. 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/HUA180101401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1e0c1eda7819561fb5538a76338e0bf64f8c42546597fd4330963af31b5f5d. 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/HUA180101407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fdabbb38ccd349a9178c509b037dc18be515a13d47400e7c46206a24c7dc11. 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/HUA320700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f058c43b56d82f43dd989019e44e99d8a7af4c3da0227e7a1b342eb4e3baeb. 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/HUA320700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80bd1d5b9ef184a87b5ed587a2a4517deaf285b5a4992b74e7387ad7d0e576c. 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/HUA320700021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ebe847b996a5fcfc72a84cd8ba94ff292265e4aafa18ffb102821355e6036f. 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/HUA320700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f83da61d1b2d0e6beca0218174804f2de32b4ddf48ed0877151e2e7af82fc1. 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/HUA320700027.