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 0xaef6ba706a85ffdbc9ad7b86906d2449daeb32f7efc6f9abbe2de92093bb6a72. 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/ad63a79b-35a0-49ea-8b8d-554864c2b3d1.json and https://artists.proofprofile.net/proofs/artist/ad63a79b-35a0-49ea-8b8d-554864c2b3d1.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 0xc6c1c706eb2918b27df2f8d86c70569b8ae1dba4a23c5584f0b128a94801d590. 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/GBRD51400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb721db339e8d20624b5370d7bc889f25faae565779c2e35693b8ce38d6b07fdd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBRD51400177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7275d761fe73c4e8b40cd877de3d95d1c52a1b9a68a111dc28dfc2238c5b54. 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/QZPLS2453211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38423aa5bddc919799483df45a21a7be8e75c205dde2a5f49444f04150bd283. 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/QZTAW2369693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd88dee7d2af67e2c3873c6a0c728a9a2be1c664061f41006013648925f510e. 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/QZTAW2367852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eec0c1f924edf0feda6268c68333635b4338714ee5f97eb6ac6904ca0bd1f41. 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/QZPLR2330697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8846834231bd14cc133b89631cc372469b8700257ec8f9d94cdf9dae671a0030. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWQ2323344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b70c5cdc9aaf5223fc6e471f9a5b9f13a3d3fabeea54c3f12250a19cc7855a. 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/QZHN42341316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937699f2c65262be5794ca70fb4d9cd3f9f8a7df07328b405f8fa01dd4833f9e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZFZ72397638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9708abc3bc871feaa171d66365ea413ad901f7f73d1ff48616bc350cc9ec9d42. 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/QZDA42347314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabea8e2ef86d94a2cdd9a080afcc634b7a92d113a3f3ee9321b70d2ac60986ee. 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/QZTB52290966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ccbbd33da7a10badb80d1e14ce2a779fb85673517fa7df033784a6498b824d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZMEM2291739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd57c904a9383edf97964f050745a8f66c3c4c27366e7083d855daa00dcfb59. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZK6H2238240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41394ebd31a30244fb3bea0d3e15d3fea15163ec397e358145fddce6e952dc37. 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/QZK6J2210945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5df1d495db07a38b2e0f08ac5ca490451bc93457378a0d820768c912e4a667a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:03:11Z), 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/QZK6J2210462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c1027fafb7fa6060611a090fa149f69e7d6b535ee7e6f4f1f801f32b36525f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6K2299598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d99e21ff2ec2b36a8dbb681f3983bd5b96acd97aafa068489423ae4be1d286. 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/QZK6M2214066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0fb39a9108652a44cc483653bf851ce9835363b0b7d059670453b0ceeeb84c. 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/QZK6N2275467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf334fe74efeaee6651af7cfbc20d3d1c5c6bd169900070cedc266c5c2ff2391c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBQL32100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff991c7f7c69eb5b726e719e82b23767f4d2b29eda60790bffbf1dd99ff20c9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:58:58Z), 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/GBQL32000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbe6b106a7d147a41f8056e4ca45065cfb9d1ff6977f39a63f4374c83ead722. 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/GBQL32000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa040eea808092d740f4cc4d1743d56714d9a32d06f83d67236036b02dbe80f39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBQL31900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf90f9a26d4ee4d930c52a4733b484eb1b16c6f0b5f0b3dc614be2a5d4d4cc89. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBQL31900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b19257472e06e79ee212f458362ebc2ffe8bbc6ea7a3552ba04876d1d653199. 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/GBKQU1868198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2934d7c8f386da4b84d550a7ea38a684d80da14b0bef89a14ca63c652ce14b1f. 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/GBQL31800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c1a1a47d7683c6082579a8b753ea8b5f83dfb0420fb87ad6346988be83e65e. 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/GBQL31800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb102a5fd55cb6f1165c3fae9d336621a93add9c3a0c937133fd74dee3b3a4b28. 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/GBQL31800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9367c80d6bbd54ba3e8c4c28bed13bafa7ded12e0fd2d6024b45fda332f403. 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/GBRD51800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3728db639202e88452b417a72d660abdbbc55b4ca9e972a36962b0f4f613b752. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWZ2555244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b479261bfd0b98e7fadbc01e80a9587110ba2f9f35bccaeb5b49583b1ceebf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHNB2597406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db3bb5fc7c51d8d25ab4ced537c87af9fc3a583c2f41e6f3c431b9e0e4d81b8. 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/QZZ7R2461593.