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 0x2d1971f632bd3b9e073f319af63dccf6b663f842fc88c78c7855aa25f60ecdeb. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20675f4f-aded-4b1f-9db9-7bb6d754ed8b.json and https://artists.proofprofile.net/proofs/artist/20675f4f-aded-4b1f-9db9-7bb6d754ed8b.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 0x17b3c14fa80cc1e9116d26f59c4a9f30e4e9fb6f12a6dc288132c0dab873097b. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/US25L0800279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184b5d3c062100f3990ca2aebd5fc3b8ce117459a30e238fff9c372611eaa38f. 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/US25L0800280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8f0028491afd2eb20a741d4e19e3ec6cbf30438bd8ddec87173aab314c1b1d. 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/US25L0800281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf76a1b5ea5ce44286dcf34a17ce0e7fe87f3542a764343263d97756c64215c5. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/US25L0800283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a26da473aea39516b4f50ba4fe69c5ef72486d5ed7ed2cdc29c93e2f8b027da. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/US25L0800287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a7f2f81b0cefd25d912acb5d25f739f5d1ab5f3b76bbe4ccaab14dc409391e. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/US25L0800288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd119ea3c7c811d07c67ac068ce613a986d38f43fa5de7bae7062f8731479f38b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/US25L0800289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8375dc01d380a3db4019a0cf1906a35bc5a6628464798ccfd0eb593a385cd788. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US25L0800290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2999d779bea5b17e526e6b9adf0555acdc351ae15e9c687178be79fd852fc0cf. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/US25L0800292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc0e89bb664c9a28345f5ebf4ad689954df4adb4865e5c2c18bd3218e28bd47. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/US25L0800293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf76a1b5ea5ce44286dcf34a17ce0e7fe87f3542a764343263d97756c64215c5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/US25L0800283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a26da473aea39516b4f50ba4fe69c5ef72486d5ed7ed2cdc29c93e2f8b027da. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/US25L0800287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a7f2f81b0cefd25d912acb5d25f739f5d1ab5f3b76bbe4ccaab14dc409391e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/US25L0800288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd119ea3c7c811d07c67ac068ce613a986d38f43fa5de7bae7062f8731479f38b. Chain 2 (Bitcoin): anchored in block 959147 (2026-07-22T15:43:44Z), 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/US25L0800289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8375dc01d380a3db4019a0cf1906a35bc5a6628464798ccfd0eb593a385cd788. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/US25L0800290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc0e89bb664c9a28345f5ebf4ad689954df4adb4865e5c2c18bd3218e28bd47. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/US25L0800293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184b5d3c062100f3990ca2aebd5fc3b8ce117459a30e238fff9c372611eaa38f. 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/US25L0800280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8f0028491afd2eb20a741d4e19e3ec6cbf30438bd8ddec87173aab314c1b1d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/US25L0800281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7e29177bc7fca05eb4a8e506bddda728d61c0afb0a500e16eaee5837549e3e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US25L0800282.