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 0x8759e0fd47094cd56c4376881f48ca063baaf34eb7d02dc88ee9ac29ff9289eb. 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/d8cbd0e0-9923-43d2-bd44-6b36236c9e80.json and https://artists.proofprofile.net/proofs/artist/d8cbd0e0-9923-43d2-bd44-6b36236c9e80.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 0x94604fadc43cb7812ceb8aa5e8efb2b8e26dae8a9cecbee22c84beaf387b217c. 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/USCGJ2250270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76155e94f04b03c501f911cbfefe83c044c0e459a3a35acf84dd647bc1dfc905. 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/USCGJ2309232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6444e793db6ea06d1d167a7bbd2dbce0d343e09480c83a829e10edfe7e8db5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USCGJ2102235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019970ba0758f7ac142db3c1d8ebe8e134813908d2e749f8b0106ed30715a855. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USCGJ2102238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7ac8161e8ad3ea5df263aa8fe9ff08954676b59d992fc15713f4d6030fe1c2. 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/USCGH1923416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70540b5e05c32fc53992faad437f70d8c8102c8921ca905467b56af8ce3f22e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USHM92423290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9e830d2e4f3f84553bc02c35326f5bf2d445e6dd03a87d49a5e1fe099ae216. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USY282308932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2215462d287e525f88580e00b6d61694bf64b865899a3dd485ed7b517135830c. 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/USY282308892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebf2c996f29ed6c393b964e480521b865e3e4c7589adb0409f9b48f35aec1e3. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USL4R2310258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9b0800f725dd07f898cd403c785d3cc346585ea2a29cf0663dd84cd757db44. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USL4R2124609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd830a0a21f3ba2182fadb34c5ae32cfbb963745fc567fcdfa22f7092e4f0b822. 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/USL4R2124611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69fb0803ebaf69c930a1570008885b0aee2c6682fd987ffbc806b6a688c524c. 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/USL4R2124612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b20f782be17ab51275a3b8de667f07415861f1fb15b80a91a9c4acf130f3f4. 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/USL4R2124613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8c2c5ddc3f4497205914d56e13d2a506ffb6eb19a51128d1604816d7879c4c. 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/USHM82199475.