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 0x9134905e853d5cd1d2d3adb1e7723cabad5570d8ade7e1d44c15f650b803b891. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f9f6d1e-c11c-46f9-b203-1b69adaca070.json and https://artists.proofprofile.net/proofs/artist/8f9f6d1e-c11c-46f9-b203-1b69adaca070.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 0x8cce038da56cf6aba6867295b04ac9ad3c61896b99b1686c712183e5a92ae031. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TWA452313609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfb9f0c2fb0285bb66f453a76d36f052487724c8755266d9950b64778600dfb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWA452313614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0586d170b66268f3a4dfaebf2c289da0b9953236276fd18cbebb8bcac9c43eac. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWA452313621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87a457a53f9c63e28afe4154ca5c8e5c21dd2a445db01d5bc6064ff208d519f. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/TWDB52400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dfb9f526cd42ac4f002d25a6a63efa9f0ecde11072b8fcc62d7aef4efdd096. 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/TWDB52400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9071c522bb98fe9f865fed23d3439386d45294a0d73299ee917ef3af694eb280. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TWDB52400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6f96d76c63fbf66ce00ffd35a2641d1aae1ac1c6af2d343c1b293aac58e5be. 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/TWDB52000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ebd5766d6e4f1a54b6116559d335ed8f76e850b02f6e56e3b5158fc59e8e2a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWDB52000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3815f3355c8c998e69b2944a17f60254988483a22e05d4ee9a3adbbec84534c8. 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/TWDB52000033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77d19d8b7d7299f7b38b4df6ecd487696054a5495b11b3348483cd89cb50c18. 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/TWDB52000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa1498306e8320c6df77cd72422049b4dd8e3a404ce645241f3a7d96ba585fa. 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/TWDB52000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344c7ec15d835f095ac6b3ccbb50c3080bc6230ade523d3f66fc3071b4f8a160. 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/TWDB52000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7623ad82ffaad188eac20759682ecbda952d8a3343e1e069ac36a08555684390. 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/TWDB52000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c089a7ec78609bb540a4f3169e331fdfd97ce6d6afd25a41a9474946f07faba. 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/TWDB52000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ad0cd9357fdc0c69e61e3423e863bea66b020f41a88d22c2435690c05af7b0. 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/TWDB52000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1329fdf526915d7e6a8a56ac13b38ae519564eda7c63a1348e19dc68e7c17e57. 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/TWDB52000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b538223d808c1591f37c30b025088a3696aa4515f9568babb1dfb4d3c48c5b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/TWDB52000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421b1d1af0b07e1877dd56882be3b01831290969d9cb912e894cfce20e3ac4d3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TWDB52000045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8573b3d877408abf7d412179cfc1fb4a6f5cc9430ac2b5de168d042f7c9d1364. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWDB52000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b9cc3df16c007a0ef95f2579381ff0aeb1362a99c06d36089db89be76c9b3e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWDB52000048.