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 0x99646396c3bd6b488006a7455e7a846595912a6b3a1f28c336f5e9c4968b19b6. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47f0b826-8159-4fbc-8d72-1ad0a1889e91.json and https://artists.proofprofile.net/proofs/artist/47f0b826-8159-4fbc-8d72-1ad0a1889e91.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 0xc27a121c419842f52607dff77babba166b8ed0101bf000bbdcae64a7f02637c7. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZFZ42363039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fe28311d766655fffb9befc2f9c36ac23c6515870debac059255a1c73531cb. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QM6MZ2307276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39085e79dd6befacf3718b99b4a0b95be2ad663ad60195735173543f012b9b7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6MZ2307277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe9e8220f9041d0e9335467b159ece239524471d4ef34ff1a9909ba2a176147. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM6MZ2307279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb662847eb973f0e0f6e5646e6b9e6b6572666f8d72f4eaf2d6be5d21623c63c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QMBZ92330040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f7a7eea76a15fa377343846586841ba4340cde56806e3e05206d2cc08a13de. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QM4TX2418582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17df2d3643d9347d137e22c7c1e12e728e1bd353ca2106e752411d9b10c1f2cb. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM6N22454775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e482b96a123d1ee944d1b6c358b818857f911bd4d5283553e2f511ebfb4a072. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM7282400502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246a6578ea7fe196feef05d8236b12c6f1484ec6f3ccb206df2af8241b5f16bf. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QMDA72477158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18d0580fab58d18d57db93e8bd8431f747ab9cb0851e3f839cede1489448d73. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QM4TX2501926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76bfd0eeddae8d7a502d6315a9e0eca321b0fff9ed63d79666b1fa086edb3b34. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM4TX2501927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acfbe15dbde159c1c6c1b8857d44b7c62ce821ae6b3f7fb12639c270dfa2164. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM4TX2501928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232ca2561040bc5d9fd1ea26f59e9e67d2d332f106d7bee8392458f13c543b19. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6P42513567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77559525381341d6a021fee01246e87acc35ce05e68b37204b68ae9d00152722. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QM6P42513568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcba05c35ad9f24066e07bc7122eb0cfecb4094fc0679236c5be46329d9a3969. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QM6P42513569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe26c5f99aa021ebf5ec2340830d4d33f0f81b61e1db6ed5f50290c74d5ae329. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6P42513570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358faa81989834e5ec5da97bc254ab3359ea49edf7e04786e139538a2b27b213. 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/QM6P42513571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8def41cd5eb674fa73066bf45ae661478a31d3a0d06f0ca0107f15fce4fc02. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKZGC2506722.