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 0x7bcbedae9da30b6861ceefdef799c200df4a84c62e3032159672250da63ba893. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60863b15-b230-4d0e-a7fb-9a35e17dec6a.json and https://artists.proofprofile.net/proofs/artist/60863b15-b230-4d0e-a7fb-9a35e17dec6a.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 0x0f50a8e39a077d660e48a954d101a54b173f5fbf8ce7ad69e23bd1a33f1e6bcd. 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/HKG732272567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed647ced2f70d12c9dc6aa9423fd4c939dc98123e25ddee09cb035a74975be66. 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/HKG732352518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04dc66ae4d162793b8cc477871fe42c9e3a0bdcd45c94945204085142943c054. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/HKG732352517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1142366008e5fba53bcf8de5908a421315697cb666118f69c40ef34bdb30c716. 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/TWAE32400281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa156b469f50fc8b477ae6eca7f5980d7b60e6c85ecf980d979eace2b56299ee5. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TWAE32400283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fb594e291afd1da99b08d9b4a8f8d0937c51de02056c096d128dac40cb481a. 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/TWAE32400285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc49075fc96d8d88d26f15f230dd8034144ea32b7f77eb6805cb74b4760f183. 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/FRX202141496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5760e43bccd1ed1ee920e65fef9e934b31912e2ffc234644cc48b3084e1fe046. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/HKG732272529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a10e436a627dc8def59d3d6f53b6db506c21d313849a29e8739e98ed5a8853. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKG732272532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7812bb50c4b1b022b40b7a31b450f2c998032efa834483d47b7605d866a61b6e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKG732272533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbb0050a934deb9d8940a069d45c1906465addefb1a531aaada7d32cd7307d7. 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/HKG732272534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ed94d81d4048d31e0b6370eabfcbd303fb08774e25c383737ce1a4c6c4c3a8. 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/HKG732272551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960db85907d5de699342491419880dabb1cd9070d2acd3d6a715ce89a4f2fc88. 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/HKG732272552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd380928eb4e6d5999a84932b673843089bd63b7f6944ac16c0689d723c9e1ace. 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/HKG732272553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679b78811c8aaa3b8c9299db26827656abda12e5290c752b5dbe0bdcc97bac0f. 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/HKG732272574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa94afd58acf9f66940eff197209782138e07c3b3b6930606873e5c3ea9ac5dd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/HKG732272572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4063b55344ca6e4c40f27c94ef1a6f7fdac2d365feef4534ff47c3c7a1531294. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKG731405697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81fe8394952fd65542869d180cf2521a77adb65d7f2636cdea1f3a46c9106030. 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/FRX762370858.