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 0xd3f609e41022de6e110a4bec9befc265cdd9c0616d25313e4503d9148015319b. 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/27f0b25b-c627-4163-8529-f1c96c8a5c55.json and https://artists.proofprofile.net/proofs/artist/27f0b25b-c627-4163-8529-f1c96c8a5c55.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 0x5c958d56d410513e16444b70b04bbc843f4267c9a4d1afafd618a9447e6b6df0. 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/QM6N22489058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d0d25ddf43b63d9d4395d42c06c5ba12de51ed3d4d0bf086b2f7087c8c4d1c. 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/QM4TX2110230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75eb057ee985f787e998d88380b1ff91439b7bba836fd228bcfa03b03298361e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEPI82306865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff97d037167ad6033464f235706e76665c7faeb5e172a8629199995d382bd54c. 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/NLT2H2200949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cffc2f540031f8ac31f75a681354674d12b8030c812be91e10ff71f838eba8. 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/NLT2H2300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039864711d4f5ed38d1794b842aa8ba5ac112d337805881c8a8ccfa2cda48d69. 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/DEPI82214298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067babdacc783986eb07e1c97caee15acd4bd1148bf48772218daeccf5c6c0d1. 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/QM4TW2347231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30bf004f3cf09d9e37157ba8ff204b38b72e56f835e756d5714c15529e3961e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR2X42410080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e20705d9c32214843cfd81a0b7a686485ccd440a18d0281a44dd9acef7419ca. 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/DEN062200313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62874517b24658121240f8e9dbe02339d48c37c7993926820aebe22c25579936. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM6P42304354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59994aad6b0a5d40c1031673b8ce23208e01a6a259221277d689c24ff4154658. 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/QMFMF2424829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c8edb59424e794294d2f8b93428323b34d8a3a74c84e94b6ebb0f73ff710c3. 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/DEPI82216618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53a75239f5f9c960eca56478296aec7c9a22055ff45a6d19334c097645f33cf. 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/QM4TX2449936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcce4e4a61de10ac9e3325147ead08d668c5271e29eb19c6aaf039003aafb6ca. 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/QM4TX2401976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653bd2068790b84b2a429aaac2a3ab062f903321f13f06921758892fc83630e3. 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/QMFME2308459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59a3181b94a8847899de076888918fe7afc6227af2aada71f80f51d6cefa45d. 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/QMBZ92327520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24d97690294732e747b6353ca0bfce7831935b7338b48a160a200945394e92f. 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/QM6N22326524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c75a818be9fb400f9e0da14f72b659819fc29270701e395e7e3df86272e977. 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/QMFMG2304400.