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 0xc3f4982a7fa43ff09af0d05d2b4a1df36fd835d391f0cc49a680ec303d0a777c. 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/41ba2082-a519-4e60-a55b-756a0fbaab62.json and https://artists.proofprofile.net/proofs/artist/41ba2082-a519-4e60-a55b-756a0fbaab62.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 0xe1a3d62dc5cd8a1baa2625859878f38c7f979530d8e5bae3a27e9c4136969408. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBKPL1974443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06b3413c55174d9c84c156a9ad1f80ff79a13e0150a5945f326b3cfcf28eb96. 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/GBKPL2026338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63473cc24430f3cd98e51f09bcd3be212abb892d4594f8f1d84c016bb526296c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GBKPL2153079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe853c02cf9d7e036bf29973081fc766b6b74b116a882e7c679a96dba6b8c9d2e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM4TW2378576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0992ebb1fac9b17722c4e260ad04ca3d44a9267d0b96cd78cc9a1917e231e559. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/QM4TX2364521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd30e345c632f5ec3ded794e8f16f43ec785b6d6dee7bc297d6e672528e304f. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QM4TX2364188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6982ba93285a190eba7bf20682e8b8c446aff78eca605e7eab921c85d2a06b4f. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QM4TX2364584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b6ed496ddaa3c19583c5aac71db65e63f49474102efefaf54f4143ba388826. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QM4TX2364592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a20937f3236e7a998563952747a89c2a3039c2874bc4acd020ce41795e50e46. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QM6P42318116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9490ec06fb163543a660bdd3bb0dc76ad5502994631606f1b8c65695ee4e9af9. 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/QM7282305553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3945bc47bc6a0d7d188f74d3965ba4866978f6659ac782089201e401239de3. 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/QM6P42361749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e63ddd5934c82077d8c1c83983a04a61e10fd4fac06eff1815b34035d63a47. 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/QM6P42355418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a20937f3236e7a998563952747a89c2a3039c2874bc4acd020ce41795e50e46. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QM6P42318116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6364d672022b967c1439da18714a45441711090de31090a9acf13662dcc6759. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZES52534583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d40aeb0b08fb79690bdcd7919f461a4f353418711a8abfa060938a71796d87. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZNWZ2506995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b9b9e22809b5c378fb9490026244a20ddc9c4981e800316aaddb2d861013f2. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QZMEM2549698.