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 0x4410aedd1690fa29c5160fc73fdc8bdeae1638c466315b37034916b4f63d9007. 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/27527b2b-e53f-4828-a99f-ad0a8bc31502.json and https://artists.proofprofile.net/proofs/artist/27527b2b-e53f-4828-a99f-ad0a8bc31502.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 0xd18e2712cd72162ee20c386465e46e79eab9e495206f96847882fc5a887c640a. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/SE5752389915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12d6a0606358235d47bf7cc8f2f7fab381fedc8e785dd1a825eac874eb0f510. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/SE5752389916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49f44b11da4576ad3453b5c9aee9e9cf7b30c08615948859775140c93b83a2f. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/SE5752389917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dbc93a57486b2c33c9da7e0cf4de931449af4493a52103d56c8d253021556e. 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/SE5752389918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a5c8e239188673ffe28285248266dadb9245c6deff31972c6461618e963f89. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/SE5752389919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26342fc1f4d4076665dd514c52828377ad0352450ee405918ad50fdbd9aaf6b0. 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/SE6I32303409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a7f57e23fcbb9bd329f3dacc136fec3f2b73394f0b95db18e7faa558e51dc2. 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/SE6I32364899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d6e1cdacb6a9efbfc780b53189ea58e33482f31a00aaa7ab6046edcb04b6a3. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/SE6I32365066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e4b448ac80c195f184cd28efe556638ca4991e7c6dbd5f78ed8027da103297. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/SE6I32365067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35257a77b8307ea357fe0f1b5780c39323536f6ada8b759b1122411e55da9a2b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/SE6I32365068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2708938dbd7a73d150f5a1ee64c73fb249bb0fc4c14df6a1c2d9850a99958e9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/SE6I32365069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a33ded3b1d7f17e971130a953c8f2e8fcc34df7b78cc959d546f1ed6a0b2955. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/SE6I32365070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80c368f92a5a7728e562fe91215a89e0c289c263edc2fc3484c8ae6541b5fd9. 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/SE6I32365071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8825f882b2e0b179307ab24b9619bfaea38c39238119f56f7a45c7bc55a9496. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SE6I32365073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e5763948a8156c868a8532125cef16a45c11b625d713deedb4547284ea1895. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SE6I32365074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7431b939cb6bf96db4d4a4403c41ef427e89eede8d8446cff45c3e072a2df3eb. 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/SE6I32365075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c0fd3cf10080f525f0cde22290e5046e46353da15cb072e292dd924441d97f. 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/SE6I32365076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8923707fa3a66da50a461bfdd83e3bfd9c52e3d8e4fbf3664bfd0680bc05e9. 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/SE6I32365077.