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 0x301d148f8b10f575e394148fe6ed5284f6f9e4292594b33b34a17898a2a77a28. 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/01f271b3-19fd-4537-9d41-4dbf6faf82f0.json and https://artists.proofprofile.net/proofs/artist/01f271b3-19fd-4537-9d41-4dbf6faf82f0.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 0x80ef05a17eefb6595a386979ae4ebb14ca11aa42cdad7964745c68d3f9f57513. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/DGA052470395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9888185e02c8e9740799c3a48c2546e5af9c0fc6a0457dbfd072621c09763ef1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T13:44:05Z), 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/TR4020702102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bfec717943b34870d81de260b6eeace1c123991745d3f626f3f0db1921ba8c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TR1670600236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa824e161471ed6c7e58cfe7958d73d29ced5b2559609e22c696126347603e81b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TR1670600239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295d85b58f167b80c810bcc200e696d6c3ce2178fbe8ba44667aa1c4b28a1140. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T14:34:06Z), 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/TR1670600240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c825fe4e3b3d572b2344e1998340bb829ea18d361f1b9f757ce3a8cf55346b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TR1670600242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adbfd50818d8c0dc4d48b01a7f15c2a446590e36319d6cc5e6bd87a788ff5d3. 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/DGA092367635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2a967ced875900f78839ebd3fe702c2f0bb49bbb1127094eaaa8e475937f1c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TR1670600222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729073695ad746532d7463a361b1a3ee594aeb514ddddbd0eeba0f331b1f124b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T22:04:06Z), 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/TR1670600227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a4e0506442069dfc3e7f37ca255de1222abad6ef4cde09dc8013e7b8c756ef. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TR1670600233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bde2dfee68a2c2e23d7b4e404b99b1a6507c444557cb221b5592ace3ccda3c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:26:13Z), 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/TR2611301151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5654516d459c70490eb6b1faab1794e92c6e1ff87dc22dcde6f7c91dc6fbe40. 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/TR2611401381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e38fa2cef461f4a9c22968ee60cb88edc5ed492c245eafd6682a64ed357249. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TR2611401371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5743a3f489c630dcd2cd7b14949226f5b71233f91d6231dc514465d4ce4a5a47. 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/TR2611000720.