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 0x65cd80094dedbca4c2874e2c6aeb85f7b73c812e063a7d4e582cc2a9cb00db15. 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/8489f48d-9bf3-4071-9b6c-e100b4306939.json and https://artists.proofprofile.net/proofs/artist/8489f48d-9bf3-4071-9b6c-e100b4306939.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 0xd912d5f625a8bf0f64b97db1ef8c128283a336cae1bfcb67726821c118befd85. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZ24F1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4264a47732497e6c873c1a00417a279bc74971a01007cb41441071106bffb9f8. 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/QZ24F1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81e6ba96c68a15b689b537d338c82da2e608bed02822a0ddb805d0addc5fbcb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ24F1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb520ecce083a444731bb7a25960b6d2a924a6ffc879dc4c8ebbcb361410b62fb. 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/QZ24F2800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3948b65d501cd7d3285433e61cf934e5b71e13fa82bd13934936252ecb95740. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZ24F2800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41362b1542a4167b9d8d54fc150cdd56fcb4dcce451597338e86d524f15309f. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZ24F2800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677e4f1834b70e21008bbeb25345d07e8d62ea383dd0d101f79cb4bc69b1c749. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZ24F2800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd207cfb642df2541ea2974bbbe87a2fea0d36d10a12cc32c9f9dda411e365745. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZ24F2800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ecb649c24c518fa34967f04dcf1cc0ea4224c5bc32adfec0d1ec2e136cd3ff. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZ24F2800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323a05f05407a713041abedb8b75703464a1d5f491ba0c17163260c0526949b6. 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/QZ24F2800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95aa8adf39010b395cfaab23f388624176122812805a5ba56952a8d7533cba5c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZ24F2800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72aeac232b3e4449f66339bc8dcaa846c85bd947d9d1b35341746bd375151d4e. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZ24F2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7c21d462d7aae5cac770de05412f675a7138b775d9b0172eb5f738fbecc4ed. 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/QZ24F2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ad9387d9eabee715510a6602f23582404cbdc7e2a9ef89ec200d5b0fe8d1c0. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZ24F2100005.