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 0xa77ddc6067e08a6473453140bc0359a369959cd1ea3f0b32c296df3373bbafff. 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/6a403063-d6d4-49e9-94f8-cb042850f0ea.json and https://artists.proofprofile.net/proofs/artist/6a403063-d6d4-49e9-94f8-cb042850f0ea.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 0x06a43d00e844def62894d8f04a01a71e57e85b2030965d0a25d4788cda7731a4. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/US3P30401012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ddbb7ad2a4742692b7d9434fa3bd1824dfe353574463deb9c81454f1973df9. 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/US3P30401013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa857b0000dca94d515ff1469de764de49b4edb3cf114cd8368d5163ad75f3d83. 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/US3P30401014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf901c981642586e8de6dbcae93508ac171fd5a7df43d082e90d0f97bfbae52a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US3P30401015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4ec95178bcc2b3f8523f271864a1525f7c6e62987bab24f9caeb973646cf44. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US3P30401016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe926573c8420ff018b5db4089af98ec5cb64ed62832cc69b7e138de554882d07. 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/US3P30401017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41b6f6b6f0be47a423974867b083b34321e0e8fc4f3439cc05dcb04d87a74d2. 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/US3P30401019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35be300631b69c36a899c440d2d3a78b7513bdc6d8fcfb3583091653ca88a614. 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/US3P30401021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0486dd7f4e5a4faed6ace0e0450dde4d80eb7397227a80573f3ac9ec5390a391. 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/US3P30401022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9287829a3559846b10cc58f75825667ec5eef894113af075f0c00aff395e8dd1. 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/US3P30401023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c54d0b24ad95169bbad9fb1a2bccbc652b5c53ad834be47955bf7d339e9884. 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/US3P30401072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5809e82a0aa3432872afc3d48636235dc99a438786518e980f7e20cae1bdc1af. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TCADN1845816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35be300631b69c36a899c440d2d3a78b7513bdc6d8fcfb3583091653ca88a614. 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/US3P30401021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e05841d25dd69c4f568cc7b887a96d75d079b960368fcb008b0d9a753d6f63. 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/TCADN1845887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf0d728a6c4a81305b3aeb4b45a6d08830b4d30c5a7d4110e814fbd43aae8fe. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/US3P30401088.