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 0xfd3a610b634952ae5a1e7f5a02ca8cec9f8caf0958e3e7528a1659c0c62eb306. 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/82cdf431-1b05-4e3e-9732-82add8eeed32.json and https://artists.proofprofile.net/proofs/artist/82cdf431-1b05-4e3e-9732-82add8eeed32.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 0x88ecc23340d511dbb0edefcb0f3410384bdf1f28f19858fc762c0e346ffcc011. 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/HKG732236573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988c3c8424453ab1a61324deecb24c9c9b4ad05715aac9e658c5a9e5a05e279f. 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/HKG731625375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0b814adbff75edc4c100938fb55bf981a0cf8341210308f0a122f96815e3f6. 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/HKG732236469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb83a639c78a039d9b941f80b4cca88f29421eeb7ecaef7e03bbe6d16bf26ee. 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/CNZ632400723.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39d6512a5b64de5e41fbc28de41c66a46fb508bcf069dcb7a0d68452176b5c6. 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/TWA211457801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d67b007a81d7ce9f8da96eaa23e6fbc231746b0fc362577e0929598ea711f3. 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/TWA211457802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa57ca0ef00a382e7ea60bd133cf707591dab4a1b3673d670f89ee85af0d478. 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/HKG731625931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe6208c629fb41a4b310769efc4da901f14083d6ddbe523a8dec03b7a27842f. 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/HKG731625387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed953ef2d825c2e0d8bda3429d74cf058f3cdf51c6bd1e9cfad6811e6b268eb5. 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/HKG732236586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23bf17d4507511eca9702376f54b975f8a4f962b1ccc33ed02243019e0d2f89. 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/HKD012301175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5efdfadd5db7e2c895eb9c88c5e4308383e8c46112dbb2d29f3800cd3bc1e1. 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/HKD012301174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a13364806dc5d0d7f6a65e55cc35e8a8a2895bea370db7a54b9a1447db6a80. 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/HKD012301171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e049c5799b42eebc09f841a354644da4d9a6e1f7078c668a5c07f0ec08c10d3. 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/HKD012301173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe07ee71b978e712d5a6de42bd09b728718d900cff24e90da98fb78d85b38d80. 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/HKD012301172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae1487628fc1d58c327d4927ac4dfe5fa17568a6637fba4f6a26c8a2d7f71ee. 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/HKD012301105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5ddf1919b2b8f540905a7f403c969ed73a28aa2417ec61f59feb2dfa717424. 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/CNC071501063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732fa9eee0cd8d1719184858de4c37dd26c3dd3d8427cff90bc748f2a1e4d023. 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/CNC071501066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52ad264ca3c80ecb01e26367a6b8b5104d8d0df0e33ae9def55e907e88a3eff. 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/CNC071501062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab0f88dc6a2433b4a3fd81088fcfe6cfecd53915ff5a70381f2a92222fc8eb5. 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/CNC071501067.