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 0x370d7929302a40d6fa3901f0e6e75289f6a61723b858df768a309f14f3bd7458. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10259ff9-e707-4cb2-83d5-4834228d1346.json and https://artists.proofprofile.net/proofs/artist/10259ff9-e707-4cb2-83d5-4834228d1346.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 0xf8d81165efa25d6fddb9dc9042b2becef5b81cbe67ab79c4836032be36a99327. 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/FR13Z1900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b798d88db9b328ed2e94c3667dbba5de294ce3c363cc5c78289be1aaa17324. 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/FR13Z1900093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55bf806947ef139067e85f900d89292aaf42e8a2958c559c23e1e241f573ce3. 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/FR13Z2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea072a797cef83421e69092a39cc5b23fc4ce57f2f478d3690fca17e715b16a6. 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/FRP3F1902360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c57246a96d32f238c0330202e81d08a73c8d12f6bcf8230d0f7185beea2284d. 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/FR9W11915477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacfc27f00d52c70148a0ccc3e208552eec1e676261da5daf0807dde0cdd0343. 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/FR9W11904765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320ab5ec80bac860043a16db67627d06082f6d44589da8c232a1dd12257310ad. 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/FR9W11915481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c2c11292ac07218c00a3a32166f3a3de147bd4ea61dcd9b9eae26db19c2e6d. 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/FR9W11904771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20781f3d55ba4179cc10e0c4d53446b40c5e110e1af9fdbeab6b4605b5d3b45. 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/FR9W11904767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd99c4876f0e57fdf81be723e2c404135398f8acd37b1a35c2e65324df42b71. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FR9W11915484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1e0331a30d028918161960009d751d7802985669b38a4d338cf2cc9cff43ef. 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/FR9W11915478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff3aeb630473af58cc5fb83f3d0a4992d5c82bd841d1afe546840577763950c. 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/FR9W11904768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66481f66e5a8b72ed9cb8bbeac06ba7c25b1d543797b858d99eb82e6634eec41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W11915479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629825e6915b64f9f2a32fb12e0a3e144477629a6900b8b2fba83797c0ab98e7. 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/FR9W11915485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3244f85b63de842f10d6b5229e65db7775dc28ced0e71df90245d32181a08b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W11904769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8415d2ffbc1fdc767b0a99a486fe0ebf1bf4e2ec1bbeb57c58e2b4f6f2267b27. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR9W11904778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce1b873674c51a78b9fae25f3718d563fa42c35d9021f2ac2c8ef78075808b7. 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/FR9W11915480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e136b1735c684243d6fc22a66c39cf719e90ba139dd2ae196a80e07ad3a3600. 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/FR9W12108842.