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 0x47dfffa898ec70168ea8cf6559035fb9cbb96387d209c4bc81f45d212b682a6d. 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/87f291ec-52c8-42ad-80c5-3b13c6011e64.json and https://artists.proofprofile.net/proofs/artist/87f291ec-52c8-42ad-80c5-3b13c6011e64.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x769f88bc953974413fe4245b1d5c827610dd55eca4cbf8cb05dbbdd0e0aecee7. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZP7F2533648.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146a81a4be9b0b273acebbc3f792f49376d6df63a6394ea29d93c502aadd96a5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZP7F2533649.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6881956beaa6c163c3dc93eed4ef7918833ae4a28840d37301a09d7ecaaafe. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZP7F2533650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b93570be5bde041790e5efcb6730ad972c9c4b21660cf516edc53a0096102c4. 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/QZP7F2533651.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c32370b1c93128ed97b59be48b4266314af16c4877d4fe02bb3546333be16c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZP7F2533652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21049e4ab5083603ea5e97a6f555d5096055d7c3c1fde5322cf435d28264774. 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/QZP7F2533653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda21a29aae70a035c254a100ac94b3823c5bf987010ac684db60690272688741. 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/QZP7F2533654.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e40410ec16fa7274c4d311d3bd0bad095ca509e666cb6a0fe8b51352c540daf. 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/QZP7F2533655.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf740ee1d0464bc0826ef1711cf411a4d56558873389847da8ff419946d884413. 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/QZP7F2532711.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903ebbc7f5d242b08afda9868d807f7e3f487f2cc2cb297c20d6dc41aa88ee61. 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/QZP7F2532691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3261c226ef51cc738d4521982c51bb7949400c7653e14a40ce948dc797759412. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZP7F2532693.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a581e65c1c629c1dc7e5ff46fc16fd7c0a832069a6a9c2204d77bd9f32a12ac. 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/SE5W32009604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35205a3e5c8bbae406da80863635271b7ba154709e317c8e0ebd2e791c9dc3ae. 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/SE5W32009605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a96b94166a0f097b4a4c65e259ce042bf754970f8e8f6c903fc0c71ff78e47. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/SE5W32009601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269ca52c70b08ce30810cd3d3569af4f1824668d90f0d3d423f15228294b647f. 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/SE5W32009603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5640c4af3b713c8e6c6235ffe7b03e29382fbc4c6216e6d256e72103fbfad8ef. 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/SE5W31909602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e568785baef15e831982329efa5d45992b6d5cc706998842832ff6d0227b31. 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/SE5W31909603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe316ba54b6e951ad0723235f9747d323bd6dc2295477d80f8ef77ab0f494fdd8. 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/SE5W31909605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4443cbc19a6390450da3cf5b1f3492e1704fa6a85a210523fca25d3aa3e6c45. 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/SE5W31909606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebf91b13ad9917248327baa51b3327a5a74bafdb0a590a3e1084a325120c920. 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/SE5W31909607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200f11cfb02ec1f88ccefe88f5628a1fc9e766380c22b1ca2e0bb66727e0dbee. 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/SE5W31909608.