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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 0x8a12cbd4b4edc65e8d5d9518f743090dcaa5b0f723bb990b8c33afc9d64ebb36. Chain 2 (Bitcoin): anchored in block 953722 (2026-06-15T01:21:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ab63e59-25b5-498a-9cc9-eeb11bf5c1e3.json and https://artists.proofprofile.net/proofs/artist/8ab63e59-25b5-498a-9cc9-eeb11bf5c1e3.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 0xb26b7159646b103d1fc40538b5944142fd0c2709af22967d4affc13050198ad5. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/CH0801442901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d623444681845c0cee3cb307958de2b52df8116e2ab41642392205391ebfc8b. 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/CH0801442902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff0f1b92b4c9a92f49a21674c78b652120fa277d122059a148b1475421aa45b. 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/CH0801442801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e87c60c198664598ff17b66c1100b19dce5fc63ceea0d930ec1d2b1b281c9ae. 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/CH0801442802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd7b1f8101b7311ca8c2d195dbe19f88cb34c905fea619321aff4a52b1f7362. 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/CH0801442803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f26fda3117a2c5b498be26488a8a288eca6185b44b45c9293d7250e74b507e. 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/CH0801442804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc7130873a1f0a613b00487c678cfdb538d62037ea6ca5e6f2a0d68876248ee. 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/CH0801442805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9d1681d788c07c0d505056752f59c40177254f6471acf7ab8883df70715fd8. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CH0801442806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d2263cfa7edf193f5edef40baa35d49a6668b9fda7dcca781ce842ffa2857c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CH0801442807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c353db4bc1a25bb8a23bbe681866dfdf48ea96c00120ed9fc12a9f9935e650. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CH0801442808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ff248475ac2cf09df7f764c49facd0be9d676f1ff3c823d7c29f38bf1d4e29. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH0801442809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27eb1d06418103126d231259243dc849bcb073f9f043797ce955c064d669e240. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CH0801442810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971ece5a40a5652b43048fe7629be8e677b3d05439899a5ad290856207c26d12. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CH0801442811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27fa37640dd9b7fd3666b67bb4890af9376237f8b4aa2442c4d6d19be91e1726. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CH0801442812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f9944bdb65a85b7303a986e330ead91c7d27de199009461896af6778a71711. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CH0801442813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0bb5023cb8e5d550ff32c8b3970cf3da6c9ac0b1e6e4003c3d10f6575b239c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CH0801442814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd56dd9a4fa12b4a466f25e280b46fd8dc492882660cabef336c03b53fe4f0b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CH0801442815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51666a7609cd9a2aad86f0795072a48d14babf922cef2e3fb5b52ea143aa3b05. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CH0801442816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fb3c4cd7909d686b625c7f492e5b892a01f2aac3cb0594eaca14dce9c4a38b. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/CH0801442702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531963e8272daed0794af82031a86ff2c09d3520446616fc7b46a86b2a9ce88f. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/CH0801442703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bad62ce2832467e85934a286d972e453ac2f233d01329b65ed16f39ce7182c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CH0801126802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf6507347adb074a916ea2435b9fec2a17f957c9855cf6e946d56185a636394. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/CH7812109293.