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 0x67c9b4104d30c5dbd950a39c86a527755f089f43cf718cd1cc1f8e18026e6956. 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/30414e72-f183-4775-9220-506250c3fccf.json and https://artists.proofprofile.net/proofs/artist/30414e72-f183-4775-9220-506250c3fccf.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 0x401510c9ebf6ade204021d271479e83ee2449ca34cb96fbfe64dc328064cc70e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZJL41900244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f994d3237876f2ee51dc55159e38767d6c0b5781e6977e54602bae885a4a3c. 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/CA5KR0036510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0f8f378a3a8cb2342e3da8c5ce400bc3b17202f17994751a69b8b20b933266. 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/QMANG2429612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0718b1fb0d4cf74dc5e15b740e01d87e31bc5fc9f97fa1e9f6c258260d175c49. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/TCAHS2349981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa47ad13b645b00d8816e432e0607eebc97171d2fb2ac329b831e8abd457ab1. 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/QM24S2201796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b584fadd5d0795478b72a0594133cb7399de0c1fd0019d28a2e7950e7564cf9. 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/CA5KR0008660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5968d3fd38d01c6ce02fa72d142c50f69e744a803a29b0aa3c187fb5c30555. 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/CA5KR0008661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45637a80402167769eb1511dd2916a3d6b729ff02c25119f4e43543fb0f61f2. 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/CA5KR0008662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63db790f4a1f93d9bbdbcd71156508d9d39c46169b89300479956a02301dfd69. 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/CA5KR0008663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460de290c101f84e49bb4fd15198700b6783331d29f8c5aa90f39d56ede93ff6. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CA5KR0008664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdbbdcdec61c9ee16bc1beca44a54c89465d5c1a0ef291f8aef6a830e782099. 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/CA5KR0008665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518c5e268ea9106c2534cfd16f5e23be8b53a03494882c54f6960ba242ecca00. 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/CA5KR0008666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7146932ab0b695effe9ddade2a8788192fe68571fcda5c2c50d351bd386e5d. 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/CA5KR0007547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a06c488c8bf7e3b3008f6348af134ca7d514be90be2536ddeee5711b9a9859. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CA5KR2206145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175f44adde1c855bc08ce1c5bd19a9d821bd13573233ac99bd2079cb87af9b3c. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/CA5KR2206146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf2364129da41f94c7fefe9494abcae8a99259e7974b38356654a2168831f31. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CA5KR2206147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647a9804f30600f7cabe79528cbb62623a11c9eee303082c8c16ea61d2409ecc. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CA5KR2206148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ecfb7235fe4351bb62811be290b36e4049de0b9e08cba842b324c5b7a99f66. 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/CA5KR2206149.