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 0xd010d46eaa4b46c377fdc7e1bf351a811332754121e791895546fc713653cf64. 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/feaba76e-2e3d-4bae-9c39-d2e305fb60b4.json and https://artists.proofprofile.net/proofs/artist/feaba76e-2e3d-4bae-9c39-d2e305fb60b4.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 0x29b616e1158aba0cc694a651fa0b252bd14e16ca99920165e40551a4143f0982. 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/ES7421400190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2db15c10f779938ef638db460be6a1c0e83bc98f50f4d8961e74ac276357780. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/ES7421400192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f1ec9df9f072a8b4245eaaff0f1ba699b9c0ca446a57d534ca79d2c6245489. 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/ES7421400194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb494e2c251858481f62bc314ac2ede6f400f77fe9d31c70263a578de650b6993. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ES7421400196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02863825787bfbd8caf50217b221c0a9c072b561d142fad271b0406bdbc45fef. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM4TW1739695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ddc7b6c45fa00c0b8f036e6f5bac9e5d45decaff809faaa681176f4411c5962. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QM4TW1739697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d11361e65a7edc3194427041281a84fcb99fbd35e84adc2f822192d551600d3. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM4TW1739699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43193df9a0253e1e3bfced89ba16f3f023c0def0ada815926d85cd73bd86f8f1. 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/QM4TW1739700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0f195af4a4cb922c482ef03f6d9cbafa480aa36523cdc752efd208936b9692. 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/ES20D2100402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be125a97de6c976ff993f39a76e9c179ef2a545f28edf881a4daff094ffd97a. 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/ES20D2100404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fbcc04ccaa55e134be34dc0a51198331b4c6d9371b43d6a40ee35aaa4cd0f7. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/ES20D2100406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18530fe4afbee00d0ca2d67d92d14bb0c23105472f60be22fa7dcd618c266053. 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/QM4TX2487815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe01467075ad7d5c79376d6db47335765414726a6badeeb6d0ac8dabb020343d. 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/QMDA72562421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccf1245f953827b636e33cdaafb35cbacc7adb018d3fcf26f2c389af6ac2bae. 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/QZFZ32037949.