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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bda3f49e9770e8f7534a1e5369692d7182e80ee29267c5e59394066d571c41. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfa3ded0-673d-4745-96ab-e82f9e6686de.json and https://artists.proofprofile.net/proofs/artist/cfa3ded0-673d-4745-96ab-e82f9e6686de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
乘著歌聲的翅膀-楊軼童鋼琴獨奏專輯
土耳其進行曲（選自歌唱劇《雅典的廢墟》）
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c013fc9bbcbe2a38a049069fea5a74c565dbb342a6a9f018999a2d3eb5893b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TWA171802501.
費加洛的詠歎調（選自歌劇《費加洛的婚禮》）
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4c6198522b4834cab7b7aed67a22017fb9af2181f2a4f6a1dc2523e0e50524. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TWA171802502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea32ab5cec75d0a1f10d89e0373b468cf1eb4daaf2547809eb7075490b6c62f4. 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/TWA171802503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6c708c4b1a2336ee01833cf8a4fc8f7b9cc76f1f62226e1b892173fa22e654. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWA171802505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7875a87fb7e1eca19618cda92e7140f6fbb9e4ea4b8c907f240cb541a484ebec. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWA171802509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177ab4af8f1e2e2f1a970c3f2d452ec54806f9daaf3bd5b47208401040cbff41. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWA171802510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb3d3b59b14239896705c263c1bacc2c043990ef7b82a0bf2022bca056c824a. 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/TWA171802513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d7c8f5681617061288282db2aa40142452511e8ee710ae2646d798f564a160. 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/TWA171802515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2644debea318be3aa39099548ca683ea2e2bc5f25aa804d3231df6fbe7bc57c1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWA171802516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fdb2ef8bf9b8095639c7c249026ecbee8663f912ca28a8e5e31f00086531c1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWA171802518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8499e16747211fc4470e62f638de03036b81198d0344ce5b274ef294d5b7973. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TWA171802504.
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 0xa40ea78dc427d4ed2856cca5a7e8ce8962800b27fca386bf81246147d7511b9a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TWA171802508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01259133c7c3eb369f5fcffe4962d76574e3673c1adfc1e88e06d79b3e32fb8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TWA171802511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81086c31b3c2972aa9deb6e0d424026e387094f347f386db4f7d125a6040607. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/TWA171802517.