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 0x06d791aafaa7620758b36d9804ec0f8d7b0738c721c98e69e59d2c5291d19bc6. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c313134-2874-4132-b40e-f9a5523cde9f.json and https://artists.proofprofile.net/proofs/artist/1c313134-2874-4132-b40e-f9a5523cde9f.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 0x056a51b3f13ee620a0297002ce5a5b7ac7ad335d65fe39e2b534ccbd9e771309. 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/QZHN82132604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2046f56c819087fac7f9befacb10c743a29d446b458289108b53e99ef64c55. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZHN42145252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aa6b2234a5bc0cdfb010a55177eae182a9a25ef82859cf8cc70002370c8584. 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/QZTB22231106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b550ee5123839b43e702793b3496fd37ce7ac08cac75dc4fac68c7521dd8831. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZDA72412252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d261cc1da3368f88818eb2b8306c7c2708ae4a2b812c4d2206a3768f555eb1d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZK6Q2449191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b550ee5123839b43e702793b3496fd37ce7ac08cac75dc4fac68c7521dd8831. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZDA72412252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e8f799a889fe1b36f0db9a15274a4b00c90b3e6bbb6a0b4972126b82addeac. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZK6P2425818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486b2379d3200a3a6afa89c556a00f0b6961b714d1bcb86f546c9f8b46955606. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFN2371226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943085fc6fbd94fd958f8c6bd8daefac7a484e22c92ec28436caf722edd5fc14. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3EX2403603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f15e74f84d9188b708f68e28bd2c6672d9ed05e1cd6f5c43a66bd7e3fd8d350. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82539962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a6626e9775344ddc5c96ace27f8b2e9fc544efe6ce00e5680369b18aba618f. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZDA52539631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdc1ca75dcf7d10fc789d8a39536aa3ef119d4da42c0ebdf09ef9837a890acf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFS2464853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc058e52b8a1763767629af70216b169c61c362e2af16aa0b119924d6e5ff410. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZWFF2437127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce3086dd498171f6ea2cb5adf9f05af22d2f77450873c778bff4f87ce9bb354. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZZ7K2518788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ff334c1092bd3bdb09284abb9685e475167d5cfa08c793d88bd1839b7f2ed9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3F32521215.