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 0xb9d803203720ec239090b5881bbcea9a32a8920f5687962d08111f19962cc706. 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/3281318c-c957-4006-868b-6ae88e7beb04.json and https://artists.proofprofile.net/proofs/artist/3281318c-c957-4006-868b-6ae88e7beb04.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 0x91cec94586281c0e7b0eb2e06ce3443f0c27259543e3c2f3422e027c1756fc93. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/NO2D81621002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d2de6d8af9e9768b5d4fb411faf5db58efc76e63210a70767af3fea7adb51b. 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/NO2D81621005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60fce2e86da6fbbb84573026c479ccc81eff9b79626e49edc503db8e89fa41b. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/NO2D81621008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b28fa4233883627fbd19a3ee4dc25c8d545e35067bc04d7ddabcf35e66e7ec. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/NO2D81621006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba3849e04fd0c3f873f9ef4404b6880f2013ba1e16073fcdc33588496548892. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NO05Y1801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea7abf527070686d9d3bab76a7a64a3a752deb3ceb8f23abb97512f78989356. 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/NO05Y1901001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d30d96b00bd2f9f9745a355157b1a08eb0f2d01aa41069ebb4d8e67ad39247. 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/NO05Y1901002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5ca517a6e57596b7cc4bfe6d0b4130c7b3c09dec7825334849a92c191aafaf. 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/NO05Y1901003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe042d3aee9f3872ed27a372ff973c1e1d0debea5507a863a2cf9660830408d6e. 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/NO05Y1901004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1903d27f3b12c5af11b713dfee8a7ef106efbb140a5e42f38e042611bf7b54e8. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NO05Y1901005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc768d0e79e15b795a2c6296ddc8aa75d56fce327ca20857d35d8b4ba2d67196f. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NO05Y1901006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ccb5f8c2583116d92d848fe91993af66dac59b656f742cc305f2502283b484. 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/NO05Y1901007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8968bac75fa368b1a064f961dcb4850f0ed63943869d62d06a38bccb29858331. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NO05Y1901008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59953b82e8f8c325faf4ca56b34ffae65ae03d69368e9ba2fa8b6f11ea0183e8. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NO05Y1901010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b4accfa32259678c60c36b8d6aceb81c5c9492f592bb035608bf045f8f106d. 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/NO05Y2201001.