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 0x68abd71693dfa88f10301ab09021d0af0cc177b1abf2bfe89614c39e5c4e5e67. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e2f2bd6-f22a-4ad3-b172-f34bcedfa480.json and https://artists.proofprofile.net/proofs/artist/5e2f2bd6-f22a-4ad3-b172-f34bcedfa480.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 0x7d76db7c2d7744894fcbbec3719ba0578bf682a36fc1175cfefbe0b2422d4844. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM9AA1473921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa714c4c69abeb18e9fd4e3ea69a4bffe9d11e415d19469587eac41f3bac2bb. 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/QM9AA1473922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c99d4178286661147a9a826e437a2aec752f35135417e4b2202dcded7dfa82. 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/QM9AA1473923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ffd116b5ec885ffb6220bed031f195acb4fd2389942a4446a363e6c7162047. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QM9AA1473924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa080490c74bd70248597fd42cceeae697768ef7ef9ec610ce1a04dd79d64a331. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGJ1346004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b001c26c1976f54ff8100a55dcde0e4bb1fb1184d48ae956d7f541ea4e3353. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USCGJ1346005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32246429ff99835dbd0a8e2751e55bbad01d13b3ef82caa89835a252d023989f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGJ1346006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99647a699fc7a67b591e119479b90b200bee83587c2275ecae0a5a2059e3ae1. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USCGJ1346007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fd6d100160248b426e7ee7e85791c0085fc311edcec7cea1b6df49d1c086de. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USCGJ1346008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd28359005441067c4c39781cbf4ef068565d64e1b388ba0381f1da3e2356d2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USCGJ1346009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa7a4ea0fa2c81e201618bcd1dc3fb042a6ba46615dae6a0f26eba5d2144dd7. 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/USCGJ1346010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe848867d9ee47ac7cfc7d567664bf91b3ac2315197b8e6da1a1b22e82781d276. 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/QZCUZ2000180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2a692f9b2bb5d5b7f3a573c3a7ff92b4c6ead4b0c97029770edcef836dcadd. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USL4Q1720167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13dbfd7b964d0db59a0c0bd293ffb681fc7745881c66eb4e6e77825f71b93243. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/USL4Q1720168.