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 0x008f4b1757760249b3173f8a3430dbc2367536ea427cc7b0d7f1095d6626020a. 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/a9bca769-7d3e-42d2-8468-2fc96deea782.json and https://artists.proofprofile.net/proofs/artist/a9bca769-7d3e-42d2-8468-2fc96deea782.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 0xb44baed59b7801e24ad3f0b3852e3955e4974837260ef20d0e9cfdb3e5438de9. 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/TCAIF2493210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e5a35e7708480f251fb5e7a0bcb2c654a33f06d78c634fee05e55b0d050075. 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/TCAIF2493240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0202f09f3c8a440e01f5c19ceed314c42fef751a2a9029685625422d1083b53a. 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/TCAIF2494354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf598d73cdc2aad26b479e0ed7bb02150c0f69b86070bc9270ed10120aeab19ec. 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/TCAID2463060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efbdc8a91977c3c01a479d2bbbd1f05ff0cfd8a4864f8bf31f04925c34c79cd. 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/TCAIF2494409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd4b7306fac7a97532fb10a0f6a7fb5de9a076cbb5c58a72944ebf0894c644b. 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/TCAIF2494459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaca75ec45d5a4211d16bef427614da68757cdc246c4a50b092e9cbba2e31fa. 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/TCAIF2428701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46e00c4e8b15a8afcb31f370c10afff76d3343326aa36420ad4e6fa9e38c771. 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/TCAIF2494520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9935693bc6ba4a6b7f4c00772f835e3b0c16f0bd0fdf336fffb1a99d3beafc1. 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/TCAIF2494532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29d0ebe54648bc5a26aa7659c9421f29adba756c8842a120389cf4dce28480d. 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/TCAIF2494549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5215dd326038d08ec99ab5fbb8e755f5530faaef0fa72a2bb71934665cecbf9. 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/QZDA52441249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea516183fb1ccf2e5c586c366e98f16fe0f9e985073da2ac4abd6406648cf2f. 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/QZDA52441250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8be2e8567113c24f261c3021aab09d88a823c130880447e55a8bb3e3020aacd. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZDA52441251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4306bd89b9c02bf25d6a1b6d926ade87ac92e2cf0c3560d554291b287a92332e. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZDA52441252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a5ce5524c145dfe7ead7c01599e48368395ffb38e06e03a56ef115de575c48. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZDA52441253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56db6cdddb02495c9f9604434552557f417ea40d421e1e347c734f94b4bf592a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZDA52441254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368b8abded89d032d8a998e2e802e61084246bb35067c82d37abb347ccbde488. 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/QZDA52441255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e126e3f8d4c060b76834dbf8fb7b379c49ac08a126b04950f67ecc059ac2ce8. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZDA52441256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69241d54b1e7673a5c2cd00ada4642143bdc1f3fff1dcb4915d290702b55f493. 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/QZDA52441257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c9ceb6d57b12a490b56553f0c73dad592824970d6a1cd4000e2cc682eb20eb. 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/QZDA52441258.