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 0x396c8e450521cfd170e39a9a41e1181ac74bbccff4bc9d5eddda7c7efc5627ba. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cb8e1ec-4eab-4735-b2d7-eafd76a634c6.json and https://artists.proofprofile.net/proofs/artist/8cb8e1ec-4eab-4735-b2d7-eafd76a634c6.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 0xdac54853659f789657415f57c88f157b8dc8f27558e827b7373c7980eefa62db. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/CA5KR2380444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965dbbca857ca1b4d92db982bd3fa197c87a5f34996c79a89626ee32f8e94a11. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CA5KR2379673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd981611fae57f0c9e798517aa091d74c95b4db0151281edee9ecbb0e4b90b2. 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/CA5KR2379675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e9338cc1d1ed0035a8ddf5328e668dfd4e4677a6aab001d85ac4404a1fe22d. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/UKXM32000160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09f7b10b229d53906a28700ba31483bc06c54e675f62cb3c466ec779b258a12. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/UKXM32000133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67419efcd6137222a6b8106111ff0b824742d070eb1f33d182b21302c5207eb4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CA5KR2309735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14472ef7156cbebf42db1efa6b451693ee91ec7ace707100e7d99c5d9f4186f. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/NLCK42237436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c002911dd6d07746c47e5053e4e01a776cb428ead427b034dff93ff5b5e2906. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/NLCK42237438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0236c4328c375db1e602551137d79385441f9ab6bf5d8776483db5609a872fad. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GB8KE2308735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8435925eac462c9c83f11f9d1a176df04c8059c4426cc969baa757ec9762bf3d. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/GB8KE2308737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3346aa774559c203a1a64ceb57ee8f9a654eaca49dfbdd1d98321c03304813. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GB8KE2308739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2884983d793e25f5805e28836782dfef82c83b84ff403eb44d30f41aba5483. 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/FRIDO2314429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea35513bb689592381329aebb0b35ee23180cfc0fc353dee3fa5d09dbf07ad5. 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/CA5KR2507209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a38b62322dcb7f13d6df43fe249c9a9a902f56f1288d1c6fe9d988f24ca35a. 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/CA5KR2507210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d3c9175c58f4f993623c63c00ec7256bc924aa1b4613981498c55ce7433cfd. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLCK42419609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc355843780ef6d827f474c5ce83c6e5b9d8e325133545f7ad25b8a026c587c19. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GB8KE2423280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda7b03b9c39569704b1f2d12ed80916b9c615650ed30008c6dde70eb506391e. 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/GB8KE2423281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ecb1418cdd5441eded2cf61e57bd2aae67bf02cbc498546638abe8aeb25a33. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UKXM32000222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810a9283819bf948335a8d09185955e17f3a0cd7e8d086e1042dc70e5f520340. 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/UKXM32000223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd77c1423b3a0ebab782b7cf49e58bfc65e97231a572211cf14e0f2155a5b29. 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/UKXM32000184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf167bf523e896f5ce7cb5c8c271be8986ab1c516373b673b3d3013b30177ef1d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/UKXM32000185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815cc0218df79d841be9766a592c0e26ad66f37c6e9f85f0516cb72e3b8464bc. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/GB8KE2308729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc95b430c66ad46c2691ba5c8e6160b722d89949205c1982cec7427e857250a5. 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/UKXM32000131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6899301850f5d681c24d43fd9a17967ce0a9eae077ece437b5c8159fd7906d4. 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/FRIDO2212726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd886aaa75b414dbbd7718a8ee2c05f968cc83e354c369d78c0be0d98bbcff11b. 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/NLCK42216427.