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 0x8b56aaf9bd926b41ce11ffbc2e92e4c2ad28602543606dfeca58d1ae97bccd4b. Chain 2 (Bitcoin): anchored in block 953710 (2026-06-14T23:32:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f5000b3-a74a-4b0e-a6d1-0eb35d2f876b.json and https://artists.proofprofile.net/proofs/artist/7f5000b3-a74a-4b0e-a6d1-0eb35d2f876b.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 0xe0f55ea68e14b68a64e4d7e36460ba3ac66b766ec3d46d90a234b729de1e2227. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZZ7K2481391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2461ce221d13cbdc6c8a2205778afa3f10c79b5304c9f3c07e8ab628a49ab0f1. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZZ7M2450427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732b000edc45d917aea920b2f508b52efe0c6c864df153edddf667b13a3ee6c5. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZZ7N2444671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5e29888fc12f225d8ef77fc92b30006bb78fd63302a3c2512d3ad4b40e6a61. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZZ7N2443634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7a7ef73db99bd4a53df982ddaba965840180f195d11997fa83a046e72bb594. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZZ7P2479384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9853866dd3c45f0c509b54577e7957e88bd97469f7ba040bd8c7808ee85d481. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7S2490712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9977bd092964011ed6c8335cc296a38e9d014a36622dfc743feb8c9bbc63449. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZZ7S2489392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4d07b1fa5217ff4ed526fc54cb6d43dd4acd4329c01b22149bc8c357639517. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7T2417503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ebfcb903c3a04643fed514fab889c24769d62e025ae670244423b4708d2ff5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7T2417504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4dae2089aae3ee547bc6366ee5b39b1dc059689b73dba4755ba533ba5b9a1e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7X2406862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978c4c90a4c82fefdd4bfa1d6434d6a0395bb4ddf07767644b9160d42fbe41d9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7X2407751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d90c6cfe4af1963014812982547bf1ae00d0859151c8b8e309ce97042400768. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZES82516696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e4858b13b44c633b5a226a5a37ab8b635e4283e0632e4b9df6433a86e6583d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZES82516697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626b5f4679a645e20f15a1178ecf9e414c209410b1c6f3ef3829e8b513941cb6. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZES82585458.