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 0x0a001ad29701752a717d16cb80f470228a1f0bad23b19e91145291065dea9de5. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d455e43f-cabb-4c2e-b651-2e127d36e14c.json and https://artists.proofprofile.net/proofs/artist/d455e43f-cabb-4c2e-b651-2e127d36e14c.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 0x18d7f958d69fb19aca3d301add81531e742f3a7c495cb5714b40830731673f1c. 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/ITLU52190208.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2afb5ff37f59a1fa0ddc4b994799d7dafeffe5afc60c91c8cb8fed87a46d6f. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ITLU52132724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c37c57069b227610ff10db5ff7a31b4411d0edf3ee207d9eab37c3e1748dd87. 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/ITLU52132725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d11ff0ebfeab9a68b8af7b7a203df519def4d57a452fc72fe1721eabaf9b60c. 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/ITLU52132726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb075f7079558d4f8864d747a76b05074791de499748d1f7446f96fe4da8f265f. 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/ITLU52132727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbc398c4fe5ec64e43522418d4e702a565761f4f6c64711d0df58b1489a9ae3. 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/ITLU52132728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c38a182a1aed4d5e1d77d6d752a9c60fe3b255d03985f6078151a5c4dd7e683. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ITLU52132729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517dccf4701d373853530c1e456ec800589347748a2ff2ce3cc756a0165f0d5e. 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/ITLU52132730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea3a607ec5a3012b21f1364251f212f4ce2a9aef108d2b35f3cc85a4834bb2b. 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/ITLU52132731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82560756ef4f215bf7ecb15a5fa8a09a67594b8e43c00d292ba8375acd55a044. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ITLU52132734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdce5e56f711e9f87debabb029ff0663743e6590cf97073668aee3571a6ae20. 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/ITLU52132737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a3b9dd758e41b94755f43a0339bd0c3736ee3aef46fce9950abdc1baa139c3. 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/ITLU52132740.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aabf39d364f3e6d66e558cfe483c7d76bff1562d830c7b032c80ae7f3a2e1a3. 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/ITO102045812.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddb779b2b7ae9085a4e899386701352a47a2e0e578df9f50aed23f9cd5c2a97. 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/ITO102023574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1edc8a4535516ebe7b18daab3a4650b1e5d7c8feb4ca45efab1f09b54b8afe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITO102023580.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e7a7c9c37d91881d02ab1e908a4c2735b1af4fa4292cfc393f70b7d9008eef. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/ITLU51892061.