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 0x86613889976375e7f0f83a665e199c3a68352ced34efa6bc61ecf6686534da3b. 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/0fe39e58-752c-4c8a-88d3-d7eda7968c60.json and https://artists.proofprofile.net/proofs/artist/0fe39e58-752c-4c8a-88d3-d7eda7968c60.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 0x57e212d49c9383fac15b2798a06c7b1e76e069178669d54d12d23a2ff4e641d5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAHY2434655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ca5964f11becb8446ec51be14610b8bcb501660bc084f28318a62fc8a1f4c4. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCAHY2434690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e875cd341082e2189ca9b94b47b8c2849df1c98e6ea0dfd8bcbe8ecd7a22722. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCAHY2434714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374516519bd3698a8472aea5f7ddb73260f083930698907164f5949f3b4021bc. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAHY2400753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba01ade18351360d8c3aae9c93b215e9502e0ba400e9ced667137add4d9e029e. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCAHY2400778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c108951caa5e46ed73531ee341a921f1fc2d79c54496ff5067da344da7b1ef9. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCAHY2400814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209f00f640e1e830279a5c848c1ecf1164cea19e3adfc218ecbf5dfd7ff7f8e0. 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/TCAHY2400835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d01f139cfefb896b3ac2690248076619af7a1778100f0b4153dedfac30b6b6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAHY2400907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4482d937ca6431d6784cbf7ba4bb3c1c900c2f5e17109bf8cdad81db3fe91cee. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAIR2473265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db6a613f4d993f15a09693fe19becb0197a588c43f5a769cb2c0c6845077cb6. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/TCAJE2513322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1711382c194e587d81a91cafec36c2d2ecf3d64def0f1f88bf46a59c46a62f. 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/TCAJE2513343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68b12640e91080d7e3e15e5f3bed68fc9462b3eceea186bf45215b678462a4e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJE2513445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e88849abed1aa7203a48d22bc2f2172f3b2075f776f99f5ded2a3d4a862e7c. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAJE2513453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226ce2d453832dcadc980ec62a0fd7fbce64f01c3a762916391257535051aad6. 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/TCAJE2513462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b806324e793d6b3758a969f38492fb0fd7fe6e7f0faab1769ae04302b941d26. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCAJE2513474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4858106eb872c55231d3cea8f016ac57de7013719a2a31b3e6704644991000. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/TCAJE2513488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9359c3181a74c2d0bbd1a97e5631a67263a495284feff081238554fa6703201e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TCAIK2412555.