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 0x806ed7a9e2cbb2c08ce8efab50f754a1e7e9cfdd6ddb9186df0dc3b086df1e81. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f72e3e0-ab80-43b3-a43e-d5e58ceb4d54.json and https://artists.proofprofile.net/proofs/artist/0f72e3e0-ab80-43b3-a43e-d5e58ceb4d54.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 0x63b78ce33e50778bee9547b410af35407e1f15f12d2a16c434435f22499ffe5f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ES71G2306256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9982bd71911e36f3f58956695288b84195f0012272582941c59f6a5c4b4438fd. 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/ES71G2305389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47545a3c120310d08643d73db83595f2cace0e1240866872192c72c2777f0dc1. 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/ES71G2306257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90537541ebe0359109bc4292cf9d5d5c27a9ea00cdc49f853346fbf6f2d7e3bf. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ES71G2306258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bd80e03178592bbe7c9119c87188182dd2f9ac7be362d74c67f7f294f4380a. 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/ES71G2306259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58eeb0aa2a369c64ad2d54dd5bee4c077314c4f687b986ad661f8afe426500e. 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/ES71G2306260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03939146307c4b9add9f5f5853744d93693d94ce7e7f10898321a61077b5e45. 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/ES71G2306261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7735a7b212abfb7a3f124b3eeb0ad84beec401781ee671ff8bc0588a5e55bc89. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES71G2306262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9530cfbd4350d90f37816c8766c2e1be16334729cc5a191d11a78b41f6c800. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES71G2337442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5ad843ae0fb5a6df0f4412611cee96b766ea8bbc2700176c6bdc82aa2de7e5. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QMDA72289737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb3a867c22e1b53b036d6193c879de052b157b7cbda7e64ec196b9debd2f5da. 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/QM6MZ2430358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c6e1f198e6f747a3c57d044786ce00cb9affd113f82192cb1db6ae5b58f190. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QM6MZ2430359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edfdd8ccd2e3371796ef04670c3b33f289602abe29ecfabf677cfc5db8e9daf. 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/QM6MZ2430360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372bba44be0543f63a79fb457c691f3b79cbbeabc9cd359997b54142f1556d54. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6MZ2430361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42cac420b0e1183ab1c0bd514a6627798ae0eeb63b61e5ac506558bed402a5b. 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/QM6MZ2430362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83effb80efeebdf3a4fc625a96562a57775052b855750e4f0b108458bbd9fc0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QM6MZ2430363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae5347b313400e50f796530ef9b189ebf9d25c7704d0adfe55efda6868873fd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM6MZ2430364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1ba9a9e6e7fbc9a6998c9e24e1420d933f0f32dea441c83ef5d75843b32ecd. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QM6MZ2426491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a14888dd6187dafc903bdfa783d75277e34bc76bdc8fa7cf0379b5fc5a5944. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM4TX2479304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ca5bba0aee2eeb1a4831f70a5e41abf732d2e9dbc33057ae4935d87f38355a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM6MZ2424433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a14888dd6187dafc903bdfa783d75277e34bc76bdc8fa7cf0379b5fc5a5944. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM4TX2479304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bad56496b37e80157e8cb9cf7d10cbe0b28ac32f83a0971a0b6017339be4d8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM4TW2480395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc53cb360fed86ce5286d6275c9f075b329aacd4fd9ac36fe632122fc27a931c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SE6QE2347963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ec1c330359a6de0e84b50365e13a3bd5191d9769308edb32072ceeffaa15e3. 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/QM22L2406559.