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 0x7878f006c41e79f35604404004d238d3e421b4504fcc25729c9b7190e446d507. 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/75e0ac98-f3ea-4149-a159-f49997386ada.json and https://artists.proofprofile.net/proofs/artist/75e0ac98-f3ea-4149-a159-f49997386ada.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 0xfa3a005185c600c38037759462e8c6d0e1414a5f7c07ff50c3f98ec2611ec5cc. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/DK6KA1601105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6990207ae8a04a9ba161ee092b5ca929d410025377229ff36055982898bed9c5. 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/DK6KA1601106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31bf6faca3d2b109b1d90acd39a7ca35f3b422489c3c50aa6d702110ed22c0d8. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DK6KA1601107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc629c0a40a9b4bcd1b0ea616a31cb014778f710096877f5b584ee3009667c3b. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-15T21:33:28Z), 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/DK6KA1601109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122e3ef754042fc13ab7f76c22814eedd76c4463bd9dc36d0863e2e680c15d53. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DK6KA1601112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfc74c58c428e1a3a725e94785c83ee4ef9ac99127013639e336db27cd3fa77. 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/DK6KA1801204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac741fe7c2cf6fe63761d7a629a8b2b1b3265d1d66941ad0d0fdcdf15192838. 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/DK6KA2301401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd295092e6f14fc99392ef9bcbea766349928945532a662cc48ca82eedcf7b161. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/DK6KA2301402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ca4496983b7a2f6cda42fb286d9ccce8044f3ae77e656ae8525f1c8071c584. 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/DK6KA2301403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6f1b280821f853f9d113ea11d6fef279e49d8cfe29ce38c0287558affaa1ca. 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/DK6KA2301404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5bff8fc04ae9042aad2b929d7264ee70c78b4b395777aa9881b387552e47ac. 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/DK6KA2301405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9d957f294471d60e27b647f5868b8149692b7d45ca8e1d8b7e6d93c95a74c1. 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/DK6KA2301408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4871c4d376418a5e39b174ee5396e1995a314d491fdaad4a88c335f70de95878. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DK6KA2301409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af4377c55a2b482ffc8983b4b6e9545096489054415cc3622d67e418f1a75e9. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NOUR62402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d08ad92e4c90bdf12c1be8c78711274a102d63722ad5b24cf13a96dcd63e482. 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/NOUR62402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466042ea3fd0ce450567e2ab31e8c92f4ef20cc9839039d08ca1a4448c70b656. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/NOUR62402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa654a62eefb6d273bc666b0c77d8a166c379651812e72c327b931bb27876821a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NOUR62402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5b0c2b7a9d0642a7b496a8e459147bf89cdee31950ca87ab1e753053d94070. 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/NOUR62402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919bc6f9545d9e257c8c0def8c55db1f13cf1bf8eff408f54f0397deda5f4709. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NOUR62402060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa214976615079c15bca74ca1229540e849bde8020b96630783418517cc3355e2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NOUR62402070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf537e08213987a86ccf230cf5755e30a95dc522642fef86d828781cd27bf2638. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NOUR62402080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a6a4d707e5cbb77cbaf6c1c3b27e8c08005da24c709dbf912f9e8e806c9888. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NOUR62402090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e177d8647ea0cc02c4314ceb96093c461e362c23d668262fe2a95bd0611a9d. 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/NOUR62402100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cce096ccb0f2f2975e9c9afcf5b91f7a784e5a717a98ca74e8622350f692012. 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/NOUR62402110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0777992d3287d70c8891c5506fd40733ad15723c7cff6b2a4b256068c7354ba1. 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/NOUR62402120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe100f456f5880c520dde42503ed582d638bc629df9a3946454a9e5455512f450. 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/NOUR62402130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af4377c55a2b482ffc8983b4b6e9545096489054415cc3622d67e418f1a75e9. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NOUR62402010.