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 0xa58ea254f5bb789b05ccbaebcb78357438c7405c8d3335dc97f8c41791554692. 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/066d3105-400f-41d5-bf2a-b409ebc3f152.json and https://artists.proofprofile.net/proofs/artist/066d3105-400f-41d5-bf2a-b409ebc3f152.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 0x3b007545bb1c2ed5b004d417342b7c867622ed2e7b72b5a8f95adfdd62f5b580. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWU2469427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a54ecd9d0a3dd1742366c9888a5d865baf7129ad232647249a6925fd54b4543. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWU2469432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f84a58def3209d4ffdd86f7ec681f246caa0bbd19c096eaa6c2d73e13f8337. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZNWU2472611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96f22a9ebc16f3ef68b405b1d6d1935bc58ad3bc8211ee7519008312ef5497d. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWU2467649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5202a6e2d050775d754c5ab0441b6f8e5f3e8b4d330dca186d008069208a1b37. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWU2464605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4e0092d2b60a924b8f263171f9a413d8251b6616f5938dc127f0c846055b87. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWU2469436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e61e01861e82efc871cfd5bce0c7f4933a33438670a057756a2d20f3645cbc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWU2467582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67483aac661cd9adfb70a423b486175721aeaba91c32e5d32c29734b177494a. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZNWU2464591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf0965adb128c51b269a17e27f363307264a972b19286a7c8b8fed5571f032c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWU2467571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7624a5146aaac69738a7252ea392931b2b970b7df1357b0d3a56013efd2fd757. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWU2435657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6852b21be237283e5082952aaea8bcecd95ee74330b76a3d273238290a70603d. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QZNWU2435655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a1e6b36754da4b1b3b4077ae75304709ce66a28c6a73a6da09f64eff5b45e3. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNWU2435646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3b727905715b3391bde4fdfda235b56c7dde5d61a90aab1fafba7bbc65c740. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZNWU2435644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7f8d04f7c46ddb5661f50ada6300c8023a58890e4dc2bae35e71dd5f1e6295. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZNWU2435640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdfdeae872fe283410e03f9c4e71453dae5d9e1721af059d9db90425917e38f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWU2469434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db9ad240b6ea345d92e6ac74d03b23ab8ad261588b9487c3c0b063a8a2cf0a3. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWU2469433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40591f41b1874b9018202c2ec3f9d35bc938f396f1a9e9815685bf37508f0fa5. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZNWV2436054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c2e64664e1bf609fcce58f13ee6393b07727d9d403f859c762d1b2bec0ee37. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWV2436039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb673a26fc876e7c2390e9a6eefbe9259b246ac82b9a6844830cd601eb562ad9. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZNWV2436024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e9e2cc835d72b3e784fb0a4f488b5fcd559378234b6a2fe97af93eec214f5a. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZNWV2438397.