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 0xba4b96abc91da4c97fe5b819a71dbc11a9fa4e5ae27cea9b7cee46476c20a761. 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/4d32422a-93ec-43f7-9dfd-e0d5959a88a0.json and https://artists.proofprofile.net/proofs/artist/4d32422a-93ec-43f7-9dfd-e0d5959a88a0.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 0x576901125141726de2bbf5c3d02fce7ce3618ec3ce187ebea5a12edc9fbcf6f6. 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/QZGLM2304373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842179203005c348db725c73f29e7f3e1b41611cf3dbde2f76855dec88084cde. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:02:59Z), 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/QZWDD2304255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b11c0d45bdcba19bd24b87b81508a3f95ac8d91a7b6598ce9148fe768d11aca. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZNJW2353637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa8f0c10ae323fd3629f44a1a93edbdd5379bd20f8af7cdaa411a3aef267a6c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHZ52097940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1767aa94d8d5961872eb006bcb631c7498164c68bfdd276402fbddd18d15e3c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BK4DA2326233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b9902c8eb0109a715673a21d951b975409976162f4632e669e1e9d4b7c9ced. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNJZ2390390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5561be0d935c10ce8a1be1e31006e9d476a5dd8cac452bf88683c741675ccc2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJY2317273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcd0bba285b6ceae58d4cf223d232430ef0214a89d26df926e35ec28448a77f. 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/QZHZ42096280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f8bf494930a157ed349db9bf01d0855a27eeac59e39b841112128a7c68fa29. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9K2267240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaca8c4a2b5b5ade3e4ba4f6837fca3ab71deef8486aacde522441b7dfe38c8f. 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/QZW9K2267254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785344546842526539a14c97e3f99f15fb8ac6cb1b7fb64cf8cd92b24872525a. 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/QZW9K2267256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bb73a1f6e7b9aae83c15ca84299e0575448b1a55faf358c8c002c5358b9dcb. 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/QZW9K2267261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b664c8809f5c48d044f8b6a08cc28669798bc932a7db54279d972001e530e0. 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/QZW9K2267263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12726bdd951879b30514ab207ef1abf602f05aa54e1dbd636b621e580a6f41c3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9K2267265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b1b6cb2c0d0bd6d325fbe7e57009f6167dd6dace0db50a274173b5c37af955. 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/QZW9K2267266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f8bf494930a157ed349db9bf01d0855a27eeac59e39b841112128a7c68fa29. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZW9K2267240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaca8c4a2b5b5ade3e4ba4f6837fca3ab71deef8486aacde522441b7dfe38c8f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZW9K2267254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785344546842526539a14c97e3f99f15fb8ac6cb1b7fb64cf8cd92b24872525a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9K2267256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bb73a1f6e7b9aae83c15ca84299e0575448b1a55faf358c8c002c5358b9dcb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZW9K2267261.