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 0xfc5ead29b0ab99eb140239664716905f4fcbcb98312c4e124a73a2ba0cb1cf56. 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/fdb17cec-e6ba-4e90-a7ea-0b80fe4ff65e.json and https://artists.proofprofile.net/proofs/artist/fdb17cec-e6ba-4e90-a7ea-0b80fe4ff65e.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 0x45a61f82bb113e9e5d35fa76d3059bbb19f3668bead1df4edba071ff637b8642. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZHNA2403823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0794c1c9b3a62ac16630b6edccbc3ff49e1e419f2b7eb7549e1742800fbb780. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZK6L2419110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb685520d23fdbdcbd940b7a2ef8fba65b459ec2b30c540ff350c4053401e5e6. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZNWR2459275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ee358fa0e129042b7e06bf91a714104c0814236e2cd459ccd2edc992398650. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZNWW2432489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77e2f89ee448ae5dcdd13e952b2b96e34912bd75b93a403412b2ea131f73912. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZNWW2408685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945e91e4b15af30bbed0df28fc59916e3dcf41dbecef2763bb247e64ec58f900. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNWW2407816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdaf5d9725430d2b3097cc44117d3d14414fc1041b6066ed7d5241b90fdfc320. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAY2444101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed6085af42ba7c3c737f64d4ce787a394f4ee34798e2691fd550ca7e3d1cb73. 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/QZTBE2487938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7172d8ffc1c1035329e77fd29c64f00f2877d41bab5dcf7d00083b4e4665f0ab. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZTB42486224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905ed19427d3873ae79eb889b09f07198a481bbcb80f5277de13e2d7cde22d86. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFM2487690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934ede1659855a9f164867251bc459a1b80bfc8f3e2c3f35a88263342d678de3. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZWFR2459287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b30796c019c93db0e77d1a699513fdf718d64671c62f533db60f96d31844ac7. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZWFX2439565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b165b5f9c13d3d9ae8aa4d2e20491c4ca7853ffdec00499f54b4f9791e8047. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZES62511252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323f3619f7abc1c67b75804959506791d7f3504e492782cf26b605306da442be. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES62511255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20a1d4abca986b9f8d5b8b1023b8b861803a05a96decd6e71e6f13100230577. 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/QZFZ72515032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7fb200efa7811471e5cf35dcc748e8c0db776eb926d32ad98e6bdd7733bda5. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZFZ72590074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208a3b585022a531cb59f2c6cfd2a0753f590bb083854bb9057495980749bdf6. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EZ2413475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690f0efb8db715ec63e2d6037c931941153ff26115fe3aa51aede7410574b686. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZES62511256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45028d1c8b9da806e01855b4018cc414fbec0b269b4bdc1f1ebee412dbb53cd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNWR2504655.