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 0xac4549bb42d68f5171ba60084cacb649cbfdfe0721ce8a5dc982b34c800e24d1. 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/3e61fd41-6c0d-4ca6-9940-24ece6a045e9.json and https://artists.proofprofile.net/proofs/artist/3e61fd41-6c0d-4ca6-9940-24ece6a045e9.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 0x5a813bfe732af839738462cf9d46387dcb096489d89775dd2eae0c67efd957c1. 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/TCABN1349236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f5ef09d9dc6c7623a73f7dd74ceafdfef5c731103c251cdfefae17afa254eb. 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/TCABN1349572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec724cbeb445b22a60165332af5ad64048b7136840b1be9eeb03796fe2770db4. 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/TCABN1349574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1974955e1506983f5304b5497bacf8c062408ca8eda1991e426057d910cdef. 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/TCABN1349576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54e2a99b6b9249b36eca502d9e900732ee75f2e1b4aa2a83743ee44c19d5bca. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/TCABN1349579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc9f042462dc8696b0338e406ac24b3a947c6c8d543346c01320ab8683a1ead. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCABW1449977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947dbd5f6db6240015630a9a17cf15cd164d66b457f27f80ff71a79874ba7279. 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/TCABW1449993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4abd95f3c9bcc3b2580b976eeda2e976a5d40dd217f4f3e35b3e631efbf407. 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/TCABW1450012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05707f2bc04d8bb41d67e7a1c75fa0c257ed1b74d9c7d4f6183de985ff2d4e71. 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/TCACE1556809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7276e47c15edafcdcea4bfd93eb7a707056c972e924aa5c2d4c3a3966645a90. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/TCACE1556803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053a47e8695fc064f6c536ba234b8959349ff134725fc6d3d993efb81150992d. 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/TCACE1556808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0bf87a99d0b2998d13b119e258f80fa4572541517eb1ed5e3811f30c2f9c21. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCACK1548084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ee744423911cb53e79c0e27b40e61dbc6b5d97220c4a18d92014e89290c51d. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/TCACK1548081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f79571d667a2fb1b70b528f3c4f34981a845392826010cb2d3cb1d937eed4a. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCACK1548186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a8cbc467087cfe574771987079936de4fd07eba3c077553e823670fda7321e. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCACK1557354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf30178cc9d3d8d55a95f9bf214dec1631b5b37b7fd8d8928959a4ef0e32b18. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCACK1539155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fb964bfeadbc497da69ced3edc92e055ab928ff61d9578ed1141931f7c194c. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAEO1952568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9474db9f06a0e168d9026c3eda2251643b32281fde0b63a8f7ab33345784399. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAEO1987093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea6e1bb00138d538b184ba6e82676808b74d5bd8ea24b22998c8e591497447f. 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/TCAIU2472910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5ec114f39580d8411183514f66fb4046de2fb47685838b9b048dc1f6deca84. 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/QZFYW2010900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04c98e191de53c02dda3fa38879f4791f79516c727264de84de6c95f2a3f5e4. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZFYZ2148351.