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 0x94358b481345c47d2fa855ed093f3119f9953107b53b12546d8927f5847b4957. 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/ffbbb410-b1ec-4a5b-970b-1a4c86fd70af.json and https://artists.proofprofile.net/proofs/artist/ffbbb410-b1ec-4a5b-970b-1a4c86fd70af.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 0x977bd572e60c153f252c6cbdac15c2bc82c48ae4adf5adae1b684b31db8d9248. 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/USZXT2353276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ae9da05d8fb78482873d84e4f188646c01c602602656d3aaacbeef2f58fe8c. 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/USZXT2350949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dad7292132017b60d9f92947916200679447712124ef5c600d829e06057cf68. 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/NOFAD2202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dffc4ab8bd32296ffa262de36d27e41c6c0aca9f23eb1aaf9a9137b0522d6a1. 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/NOFAD2105010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc351858f358a737fc503b9b3c173b082fb180a5cf9c4dd5a01532710638aff8a. 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/NOFAD2101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d852ff77f25093763c17a0078a971186dd7b9a41d23d6cc9c3293df853a32c. 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/NOFAD1910010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392b663cb463536bd76db2d4bd8bf65fb6936af3c6a625e451601ee7f220c344. 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/NOFAD1908010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb70e924a35dd71b0efa3e350c80105a934afc5656ddff63755a5c76b4fc8cd. 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/NOFAD1905010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac68845a963e70bd3c16a5ab71c7705fa9758484c5e264921db54d1c0aabe2d2. 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/NOFAD1904010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8fba2f617cc3b0f289c37995822f3be7d4e103b557072e3dc4b83ecbcbc722. 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/NOFAD1816010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56f8a80cee8c24883ed0f91176c8793549fe7a1121a0adc87e11838b68796c5. 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/NOFAD1815010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6527eb097145845114f0ebeeac152b01affa8eecb959d27929a7ee361336799f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:44:19Z), 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/NOFAD1814010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2959af2f7896ef53f6a08819eacf973e5e7a8c4d777478bcd7a62fc3a4545fdf. 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/NOFAD1813010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4294c857fc3ec7623f5ec66fe0fea60f5491031f5c50c28b6c2cdbb461d64e. 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/NOFAD1812010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c22f2dbdefab692cb37e917ec30e259aaece843d39e3f9186c90be1a87c62ef. 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/NOFAD1811010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb810822e99410ee04a234a58baf7f071df89b6d4b3e3ffdf04738c9f4ee78c35. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NOFAD1808010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76aa0c1364bc4f02a596b98c20af1b6118729a48f982264c988fffa1bfd2e20d. 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/NOFAD1805010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364b922135fb0af3f553bf50a0509130bdc1d2776c359f04d681903414def27e. 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/NOFAD1804010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21f949f6faaac53f01c6f7186b34032d89712c7a2c040fee05aa303139c8a45. 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/NOFAD1802020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0474b203a5bcfa21b5fbb47bc5e3a0b2892ca341cb62fad0be6d24a646bcdcdb. 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/GB5EA1705284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa87640d927ccdf075717865b52e23b175d75e9e5420a66236e158a7745d4cf. 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/GB5EA1704764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1242a1d35b257b6ba97b8872665354895bf88ce532580f87782811342457b38b. 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/GB5EA1501517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073d854df76e324644064795b6db2aabe8653434784b7cb73c87d30805c04ad8. 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/GB5EA1403351.