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 0xc6e0a90a2b2d2d48f2431a54874dfd6b555536061877ec85ede0b33133b7a183. 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/b252a1a3-9a50-4362-a6ec-5277806923c8.json and https://artists.proofprofile.net/proofs/artist/b252a1a3-9a50-4362-a6ec-5277806923c8.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 0x0b83aef35b160c4ea83fc0d93332720bd2c8e8b97e53444e9450c1cdd93c4ed7. 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/DGA052449446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39c677e1ca326548a39286d231acab654b2062102aca68e310bc5d28c8cc826. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FRX452439080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9db100df98427926fe4715b7865720774aec5619cda7ef450eb15c5c1eb3e47. 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/FR96X2444412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776ffc4f5ddc192c8a52104a37c3b7af4177f17fc05b60d3cc9f89638c33398f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR96X2447589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e81849e38929b0cf1dad21fbd544b3cca6bf60f5c2ac20de83337af99cd7b1e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA0R2344565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48612433bad1bd0a50b2499cdb2bb52bf10a93e50b07a78120874cd41408e40d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DGA0L2372019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9a39e9413c46ea4994dac923a6642a72aaada3869e532277a2809f76a3573f. 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/DGA0L2320602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143e74341d5efc114fe0d1aea0acd97a51b9179c157f40a26aa3a34d91ba1c23. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DGA0L2367838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ebc830a20d048ecf1d3ab9435d3995ca2e64cec04143cc97189e364928b3cc. 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/DGA0L2365559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6354701d4ad5b5e4ee191634cefe52db0a7dcb0b82f5ce539af6c5ec345e85f. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DGA082369481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177ec9bab6cde2d13a2b3b4a9b0e958c9b924b0d69e4d8638a6949530bdbcb8a. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/DGA062398339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec0bc623d87fbac083f23cd37e7f34852cca6173fc835e571c3a4379e6d7290. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DGA082367902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b49132cb93027806f2bb34674e614fc643bb5cc65f49242181b0f747ee124f. 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/HKG732349461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0178d88f11f5303b9c0aadacd82049a77667cdc02d6d953a3eb18726dfec66bd. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/FRX202321209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d048ee06773e5a564eb4b3c01d4f9de285da47d2c33b33b615444a8691ec1f. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/CNZ512200493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42b6580c07c927f0908e1eba33d1787a4b1b9d04235dadfac05b6635627d975. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRX282406624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b7aae32a3d53599030c053e446f8ea92499da81dd2ac27f2834bb058406cf7. 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/DGA0R2460085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc89cbf37648dc39401df53e8ab717e483c9123e5d02b61089ff0b3e612c2d37. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DGA0R2451705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0814bd7a00be09ab4d1a2882a187c1b25c396f57d349d4345efe86369fac090c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR10S2582637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ade6206cacc3cf0d834eeb6b69e324328d13b612a54611ed577e5edaa0ef0d. 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/DGA0L2415398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d33e348a94a2cba2617e135803eb8d249ab10823179f21cfe388dfd4c45f732. 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/DGA0M2438338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e569204c781ebe169f2da9a3c6fe22bedb663a68224ac258e93141323d87e4. 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/DGA0L2401120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93232e9be0fb021ddc3cf482f01955766ffe191b678927ead0ba30daffd5fe06. 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/DGA0H2415151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691da0409d7153344cbc8742a43eda7b531f6069e0aef1b8e8509eed3a3254bb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DGA0H2432171.