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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 0x11c91039dbc709407009a3024adb2cd4319de89398f62515f8a926c27a04f704. 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/75a6cc83-8d32-47a9-a345-89934c4ab255.json and https://artists.proofprofile.net/proofs/artist/75a6cc83-8d32-47a9-a345-89934c4ab255.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 0xaad09b0cac8b0f74cab10c2ca779d7bbc6cbd93764c957d25f7567b0a4e58a55. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLCK41029410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76279ece7504385facf84d3d05b642d14dffa66a44eeb6a2c0e53689a5fae11. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/NLCK41029411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303f3fc48be4701a537b78324848f2f187b4d79124cc2880255868389e0c9ef1. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NLCK41029413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c6a5c14f0265f2b15ce9c5c204e61ae474a3b3fa1d823693ad14dd00b56e08. 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/NLCK41045509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825e7943d335510349d272bdf3834b05e040342f723e313162aa5c55ca8ffb56. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/NLCK41074716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e552fabad4b95e204b7a46798559ac47188531dd0bed45898a497d753114fb. Chain 2 (Bitcoin): anchored in block 957552 (2026-07-11T10:04:42Z), 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/NLCK41074717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149f1be5b1387110bb4cfaf5bc6cc6937ed8565ab10bc832d900601f112e78cb. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/NLCK42216419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807053dc93501883c0dfadec26c6cdf3cc775b8109b8e83fbb844a46a370ad07. 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/NLCK42400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702914fbb57e67f761e33455007cc9c3c9e52a3a9d7cf60170d6bf2f6a87779a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLCK42400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1c31002f0f58e5701771acbea4c87ca620d837684fe7399f9db5df0f50bb0c. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/NLCK42407489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578cd9fa8a4b2deddbfa079e59506513f83d2e72fdfab5419a71266f1fa420e0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLCK42407490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08b9ed628e229e302af6bbd073517a9ede7d33dae7ed5c99b16dfc95b85be11. 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/NLCK42407491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e0160c61c9833441e8a4238e2356331097df934c4f8c04548c3ec5ea431e65. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLCK42407492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9e2ce84c23ef97b8c6bd47feb1f5141090897598e3c57cb87cafa594c57bf7. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLCK42504550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4253b3e682b0ed79b06becc722204445ae8c55cf659bc7f7faafcb5d7a374c. 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/NLCK41029408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30181ee7556d65407f8c082157cd69584fb7951a0bf02dd0460b97bbbd722d31. 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/UKN6K2402142.