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 0xca3de8a4882283f6cd0569fca9b45b47a70d8cc02e6704fae665cfa6420a55ad. 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/491c7591-792f-47da-ab8f-0e135a724f01.json and https://artists.proofprofile.net/proofs/artist/491c7591-792f-47da-ab8f-0e135a724f01.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 0xa37dbb9321f1e8230e727033700667d22147255cac62f35f07148e9b29332aa3. 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/NLS161801425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1e67c346a6e954edf49b0053b532f6ddcf2a76b3c3e516ee90afe44fa7025a. 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/NLS161801426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1844ee11798165f1b0dc77f42e56b344451905e1b9a349bbb175201ebef92e13. 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/NLS161801427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d89ce538e56a9996bd046916010d18c74ba7805ad8d068b1f89ca477c0b611. 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/NLS161801428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60968bce805c3e72280529c8f75e913ce9abed72d522c1307aa4a6d943a39366. 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/NLS161801429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7510eaded6532e8b2c95f9ad7268476f4b50d7add7f6cba592c28b262ab92bcc. 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/NLS161801430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8139784eb24347a608a583ff7a2275d8b76c4c4a20657fc5863c883a6d4cda. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLS161801431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a36cd5196e33a3dc10cff0a1deee80cc0b0e0c367232296dfac683e4ce7328. 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/NLS161801436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1026ab7db70560e575c8424549a04de6a70e386aa0bce883ea197ad2282f8cda. 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/NLS161801438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8222f6a4cb8857824a8689d840cc9aa28db8a12c8c918d18828be7de44939f. 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/NLS161801856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670ad6bf57358111981bab296dfcfbe11e569f06d08e894d7006203199f76a09. 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/NLS161801857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474911dec4c099e8cf92e961e1fe148972b2687c14737ed76519bb4157f818dd. 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/NLS161801859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4eda128799ddcb253fc20579fab2c9695eb892afac2a61b77bf8972fac9f66. 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/NLS161801860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44bd03ebe976d38f81e54c846c34c8f0c94cc57e98943dc2675072fe6efa8d2. 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/NLS161801861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd01cc05b2e2de180cad64a70ffbf65734397d00f57eb49e1f16cc76af37e39f. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T17:43:20Z), 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/NLS161801864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fcc5afe86a35f67abb472a30cd93107a088dcf2e58349f7e50f9398c5b4c0b. 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/NLS161801865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe451a4db0a74b1205a43199074b9c34d2398d86990d74567718dd371a1fa2c2. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/NLS202400025.