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 0x8fded4eb0745f8cbacb0424b86ad9ccb4c9fa05dcd241e8a70b803ac42239ef6. 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/ad3b096e-017b-4993-ac4a-84492ecdce48.json and https://artists.proofprofile.net/proofs/artist/ad3b096e-017b-4993-ac4a-84492ecdce48.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 0x4fbf66ce8bb0d4ccd1d3d0e824acaa0a6442d11fc87a06d7ee47a92ad1baaf60. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZMEN2225744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4b54302248b3fc08e7cd461d20864f988866c34aaea4f02e65ba4249dc9a72. 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/ITZRF2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b12b668b868f364987c1e622e69891d5d6003617db3270e2803788eb1bc366. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/ITZRF2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f4bce841bab47676e02df315bcaeaeb69321e9554493ba7237cc33d83c052d. 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/ITZRF2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f893a0ee7a5c7914d6a6ca9ac40707429bbdf2820d7743be4fe907491e48580. 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/ITZRF2300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3028a20492945cd84c8c82d819dbb1eebaf26c17e96e7612fa6d98e1cf9650c. 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/ITZRF2300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd5b4975693c0c3825bdd8a28508761161c903301577c8c81bef3371be3fa53. 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/ITZRF2300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ce040bae23106493a42a5bab9693e88317dbe6bcdf18557d86a5f5e4c79312. 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/ITZRF2300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4f0e5048738950f70e2b5327e9d95db622008709864fb26f6ec0f0f4bf93c2. 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/ITZRF2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7239b7e93d75c06af0f32c86ae199e2ad3ccbe59782567dc1c85051dd3d1bf96. 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/ITZRF2400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac2d1be0c67ab4207b093a0039874c82195091fb8e0265362758933249d7429. 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/ITZRF2400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62437a3fc857d4c1366d08862f17c983c059e62b9a0904874a8ef05b6fc2271. 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/ITZRF2400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac2d1be0c67ab4207b093a0039874c82195091fb8e0265362758933249d7429. 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/ITZRF2400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4e068e28ffc5b53c63d6c1c4001ac38b4d68745c5eab4aeca2f2ec645332b3. 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/ITZRF2400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4f0e5048738950f70e2b5327e9d95db622008709864fb26f6ec0f0f4bf93c2. 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/ITZRF2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa564a57996a7bb30aff9d9f54f0cb4266c7649d0a9006d43f959b8410404948b. 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/ITZRF2400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b31ccf8c98107666865faa4c2c8fd42a618947eeae03ace4def4871fe6d0c30. 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/ITZRF2400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7239b7e93d75c06af0f32c86ae199e2ad3ccbe59782567dc1c85051dd3d1bf96. 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/ITZRF2400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503bd3750f54bf23c378a0fdc39283c608ff1f52ef15db916dacce6bb02bb27a. 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/ITB002500579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0b99ee83e2c403ab76ec5c8ac8dce81b960dc4889b309e74a1ac59f3b3c31b. 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/ITZRF2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee6f773e1e2701e64694e308f4e72367e7c07efc652de8b910a21e28ec3f27c. 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/ITZRF2400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a77a5c212213037126b804ce489afcca9ecc815ff6fe6b5b9a41ac8062d4b9. 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/ITZRF2400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee6f773e1e2701e64694e308f4e72367e7c07efc652de8b910a21e28ec3f27c. 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/ITZRF2400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a77a5c212213037126b804ce489afcca9ecc815ff6fe6b5b9a41ac8062d4b9. 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/ITZRF2400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90a60cfca9165136493cb5a33b8a74d766f6028b8c1a4743a63095d9a9601fc. 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/ITZRF2400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0311e6148b59590b9da342e0304543fbfcd1479071614eda090fd05c0337de7f. 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/ITZRF2300096.