A birch is a thin-leaved deciduous hardwood tree of the genus Betula (),Sunset Western Garden Book, 1995:606–607 in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is clos
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 0xa4174cfb51861d14312f4171c31b71902b1a47a58013f43e0bf67f8225466db5. 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/566e2a61-479a-4f75-a4a4-7795e203c62b.json and https://artists.proofprofile.net/proofs/artist/566e2a61-479a-4f75-a4a4-7795e203c62b.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 0x784da1b4919694841eeef163030adea771feb0380fc92c611a8f64cfc989b94c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZMHM2024320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58091aa297e8c2710e8360663dd7d9a095396134aea02eaca240653ae3d08354. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/QZMHL2255141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f36e8bb4c36bda7cadf8112e7274d4289c26cae63bf3bbb876bb2a372c39ae7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMHN2383374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c471d79ad1e9cf2ee2e1808a4a3c77fa24cb7b8b43f2aa749ec8f5176a10db0. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZS642318254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29f8e0590a12096746c219e627e9ba22ecb9cfae39c9697e422f9cc3ec824a9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWDD2364215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e22889b6b9e03914001e4d16acdccf91d56f8b76151de8f8def245c3dd85b0e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWDD2364216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec70666bbcf97e518b85b48a3c4e52ee63386a8c6d62b1bc0ae8842416058a4. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/GB8KE2400658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6e05429ad5a2bfdb09f90994093a022157cf9c80e3f1b841b30052dd36fcaa. 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/GB8KE2400659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b78ad60381f540b4a343a1a8ad7e26938d580c0a0b19aaa7f6ceabfcecb5cb. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBRKQ2449156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fa277e4107dbde4d2899a844e15d319d8abb01466430549bab3c51d1e468a3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZWDE2570251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14b328cd01c375835e0f8b6106f2bcfe967f015bd2fee1b1a2afb6fc038ce68. 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/FRX282248227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7844895ddfd61a871758bdb11347d0e7e854426902a1d7cc0430e226a9307a0d. 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/DGA052024919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14b328cd01c375835e0f8b6106f2bcfe967f015bd2fee1b1a2afb6fc038ce68. 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/FRX282248227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7844895ddfd61a871758bdb11347d0e7e854426902a1d7cc0430e226a9307a0d. 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/DGA052024919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df08d943d650bfb37993bd7679d6c98a0be65be032ab13703d10fcfeacfa9bd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRX282139543.