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 0xa60cef5f6711a59135fe836a932402a8e7867fe02f995b2aa2da577b9e976542. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c20b2e6-761d-4275-a787-5078083e6caa.json and https://artists.proofprofile.net/proofs/artist/6c20b2e6-761d-4275-a787-5078083e6caa.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 0x2c28842109a25079865ba7658f2875b6a6b67b9423626d44724818a6c95f849b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GB8KE2405788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28cd52c4b1e59212e0c2071373d6c5355979549bb78bb729eaf4f379e96c1b4. 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/GB8KE2405789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f456a52f6be88079e7b960f6e8edde1d60a6916a13d538ec53978ab16c4f1e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB8KE2405790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624dea9a5c5113061d5f977e884c4db76551ec163860bd7c22449690380bc405. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GB8KE2405791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81367e62378642594d637faaf67f076eb0c9438bac9ccd9ba0c9cc5350267990. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB8KE2405792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40cc5114c3c147902607659f94ee8eb994be38523fef8f38d006fb8dd518b327. 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/GBLV62213885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bc4075eb7fa348484acfa98c3cb26b7a9da19b40e1b695ee06e511d635d8a5. 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/GBLV62213886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a38d688b938f9fdf5554b4711eebca58a8fc8e03f97b6ad3ef3141d10ccaa1. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBLV62213887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90ea8e0590cb0e6af43a918bb6ba8a88ac25bd40a0ce1be9e6e840b3a1d7a1d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBLV62213888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae8f4bb90a22d747f147241871ff4f1e6c63c3fbe1798ae39eb7c4786dd4d3f. 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/QM42K2261994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61641946f675a38c94f2ea5e2d77916bade12fb1ce6329f584180639467597f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QM42K2221267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2414b96853348353cae43f6a46e05acd840422a44ae3e4862420911d209351d7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM42K2111224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa961a3a0b648fd5f149563a10031b0129e8ed673c9597a2996e782c571c7b4b5. 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/QZKDK2141767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ce06c9cd32f3a7f352e5f1abd4c0cf987660fbc8a4f788502481ac50282fc2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZKDK2199948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e55fb036d0aeeb5891af172fbfff36965c4493bdae30ba11c9da6d9b744b0c7. 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/QZKDK2158188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc595e544c353c7807fc880495f4edfb782e92c0fa1958a58e0576a962143cb3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM42K2189672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c3c74dd9812e0cac9ef82af88dfe662eb239b2095110c409217bb7ef5809de. 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/QM42K2184359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cfee8864c00846c70f5f683edf95dc40a5a8d758814677a4b7925b79709967. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZKDK2118287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdca1752c8fa9f8fd052900d939000b4b9606965f80dab7be70e50121546b28. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZKDK2182734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207c0d45e7032a0a51b37ec2f3334774628a15e98d33a3ac1291b4f3aa293a96. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZKDK2161539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49b112e95ddcaff8d8c4f6d45adc9271b221dc411025c067c392ab1df623a96. 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/QM42K2141521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1af3c75732481d6e4fee75cd8a70a43daab5c3f774d536052ca6bdc77e1008a. 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/QZMHL2321609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c07bb9cc8753fbbf21bffd6dfcaed14f7cfec2a7b9ab24e4ff144f79fd0585. 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/QZS642365444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1523d3212dca66fe708fda4588ad83e8e5063616d0c001fe6b7ee3b1718cab. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZS642176878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377f0ece7df8737f11eb69b689290d90108ddde74f2591f283ace2153cb6f9a7. 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/QZS652110853.