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 0x06a29bc2cc086a92b485540918ec5299c4ce86c8ee57e20321e96c51ef32cb30. 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/b9ed4482-73ff-4412-8c8f-39ad6c734cbc.json and https://artists.proofprofile.net/proofs/artist/b9ed4482-73ff-4412-8c8f-39ad6c734cbc.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 0x91f8314866541d7bf2888e244bf47e99b74e421b9c11e2be0d545757d87dfa83. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/IL1012000437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984f6166655482a865161cc6b2a14da0b93d0201a2929fad87078c06c7b062eb. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/IL1012000346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a17c4e1e113d430becd1b21fbde4ac3a3e1c19038fea369fd48b4c3edd4234b. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/IL1012000916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45911c58fbd051811864bd7703ec64c72f38c69db9c7adbc11b8e53fd09f4423. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/IL1012101121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c3c85dd3f9d7d986652f20ea9accf70ff4d985395c44acbd949a5fdac026b9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/IL7532313446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5942fd25f5a3e987f2bebe773c5bdaba58fdd3811fee10ff3be3b584fb8325ae. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/IL1012401126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe311ccbcfa4cc50ace05050d32f762ba6c09eb162272691e237514a7827cbe30. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/IL1012501020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3a0f0f153b08bac59964285c521eeb4d158a4e3ce3b62e0a472764fdee4824. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/IL1012501754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96766bd32e9b3624fd9ed283d0b36ebc5fa719cbccc1c100d55c018ed2c660e3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/IL1012201151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57aa3124b06c0f7d368c2d97c5c73eff3e0772670052dc2c634cfbb7ad16d275. 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/IL1012200886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8abfdd4bf3f6477bde3ba8d8a376d3164723f0999f00743498dbe21fab48c1. 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/IL1012200759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943087e31b5634149051e9b03f87465988fd5966e50775110e4f8abcb45a0b05. 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/IL7532212844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b15c62cbd075fbe3eabb45770dc7f38d9c2e41df67f849bc8c1d3e710c9e930. 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/IL1012201219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe38c390553034e99e4a718d35e531f0c6fb23a71bd1b42ed2b86708fe9506b. 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/IL1012200776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef67a03593913ba78571c2ff07c6b0f812c1f9c7dd7c7265025ae17e66ce57ea. 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/IL1041904611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb4ca147fe7d2bf4cc7336ceaee72a41d6a55ceae46f694085937c172994fda. 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/IL7111900286.