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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a9671001aaacb2bb2af7633a9b311fe9b4b08b71f4996490b57ab13ab883f7. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cb8d6a9-0077-4cba-a623-2bf83273ad48.json and https://artists.proofprofile.net/proofs/artist/4cb8d6a9-0077-4cba-a623-2bf83273ad48.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e8c0e527b96802b900e994ea3c5e1550a10229e280fd3792cde4c19d33d518. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCABY1417984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975b529ec9ebe81560fb02c7d7aa5d5480dbf491c9f64912c625a7bf87cbf317. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCABY1417990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b25a3676693a8c418a241064d89ad6289acbc53e031686a9d298c8bb598b09. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCABY1417992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4fa702041e90b67dcc48fe891bf536af9917be58ab386dd9e53cfc4f9ec65a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:29:27Z), 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/TCABY1417996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2800bca1f2057c7a5d7ae0dee9e511a60eb07603c94ca71ef98aeda98dc7cd. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCABY1418005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322db4664fcf5d381993c40c53bb8401c3605f59385b7c156c039935d42c0258. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USH7N2400145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b8f8bbac2861c22e6ce08a8d1bf0a4a781424d4e146b45f85d85d5088741d1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USH7N2400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cac539327e14a95fd16285b9d676c9c6d46cf72bdc4549ffb1ea0a8a54230f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USH7N2400149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430f805dd431dc52129862494755d6510f6c8642687cb8ad96ef93c8efef3043. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USH7N2400138.
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 0x6eabd859d21a34d5158d6890520e15ce9a144b714773e30878b58e3d40e87e65. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USH7N2400139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a34c7ee3a61320389c0ea92f838bd7195ae33539e19c4de7dd017ef91eaeb0. 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/USH7N2400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c0d27b83192f8ad054be7b8671a8720c8fa119096142c5ced58b5297318029. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USH7N2400141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80523f72e037b98ac68501bad079954d44c41ccb40b7885a9f80977dedad614. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USH7N2400142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b23473d8b400b53e5a3c8bcde3ab94a555b6bceeb1d0f5254ad34be15cb299c. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USH7N2400143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c8e731137c4facfe07af61fceaa070b0d8e2eaa14604d5c6b6f53bbabc9248. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USH7N2400144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd210d9de1c2a0286ad2d30702abde38f77b502ffa9d4446f5bea62ded04e7900. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/USH7N2400147.