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 0xead4120230e0b241db1d74edfea78d361c29d26692a95f6b16de140d6e00d873. 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/639b4155-8d39-4d46-a6e0-7f0a98050825.json and https://artists.proofprofile.net/proofs/artist/639b4155-8d39-4d46-a6e0-7f0a98050825.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 0x13c8dfd4058fd17cec61808375e705a1809a3b15599eb9f31544131e6be0def4. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T19:58:30Z), 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/CAHQJ2290181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f861749a1c531e3fe7f280100b20f80eff9def6c2532629dab3017057d19bf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLX3Y2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc12cdedb3ecfa47c4ffb5adf9f1f9217174c4e34536861063100f62fc19172. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLX3Y2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac373cfa6820259ebcb090e57cad636a45bd3bc83ecae8cc41980646eab7d09. 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/NLX3Y2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc649daca8ebab13b9624ddd11ed0848a7eb8303f65311c94962f912e2c32d1. 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/CA5KR2464691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fba0f1130effb13f5fa7943414faa73496194f760c9dccbd973834d1cadc62. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CA5KR2464692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54493b4046072c1f50efc9154cea35cb84395be05ddd33236d0251aee0d0c611. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA5KR2367006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc649daca8ebab13b9624ddd11ed0848a7eb8303f65311c94962f912e2c32d1. 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/CA5KR2464691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9708e35d267f25a15c6826d32a2854aac822a7d98860c8dff3ff36ee0aec9a24. 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/CA5KR2426413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5925c03c194c4777b3fd665da3c286231e2eb4e87238b1fe72eedc06c2a992ff. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CAHQJ2274243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86372097a213231f6ef96a92f99bc0f860ada50b9b5cc81454f0b637897ac81. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/CAENV2263251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64e84d2c2de02daa7a9eb830c9732b5d7ec962b1edd12fd34ea604352feaf26. 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/CA5KR2354765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dc525a43a83ec71b01bb5efff2e3846d55be48c00b7504086ab80d76e4a8d1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T05:03:28Z), 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/QZTGW2401170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860c492f0aa4125a451f06704a68069baf89acbb5f542822cf4675830e92a02c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CA5KR2383117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2081d264ddf7895dcfa1c1ea50beb7653a6fc5caffceb4963397d8287e50f23. 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/CA5KR2354766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4171256cad8752ea44e6e86b311c1a528fe5c927b150041613d5101a5b18a6c. 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/CAGOO2220555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e93022dddbf5bbff3a32f265d003a2eacc1fa40a859e6dc1c14a8888d6744ab. 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/CAENV2263308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0086b5365b063e0333c6eb07cdfea7b5a5b0766c64a2134fa3b6648cca2032. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZTGW2401373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88ebdb8975af8fbd48224d4e5fa939f74e3e895e99aaaf463e8be02c5c637e4. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/CAHQJ2260269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699681500229d3bb348b64dbc4b4bce875487f0e9f8db69d61dd616147d6dd62. 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/CA5KR2426414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e387018979a1df2f4f5d141404e465d5f0ac823b097ee40b834b9b91fbf42a. 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/CA5KR2370731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc649daca8ebab13b9624ddd11ed0848a7eb8303f65311c94962f912e2c32d1. 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/CA5KR2464691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee001f4195655ce5a012186c6cc8fd7f080bc9055809e9bd6c77d3a6f07199b3. 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/CAHQJ2294321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c8dfd4058fd17cec61808375e705a1809a3b15599eb9f31544131e6be0def4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/CAHQJ2290181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea072edc39fa27a0efac99e41f67a64328479bc9487320558faed4b56e055e57. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/CA5KR2340043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90eb0162f5d723145313cae13afc4dc9a3f5db6ce9de0271989f4739619c0326. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CA5KR2383120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fba0f1130effb13f5fa7943414faa73496194f760c9dccbd973834d1cadc62. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:19:36Z), 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/CA5KR2464692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a24ea5473cdab455c0f8b005659368e45157baccafb2b2751c1fceab263ec9f. 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/QZTGW2402848.