thumb|Hem detail with inscriptions (Saint-John in Crucifixion, Vicino da Ferrara, 1469–70) In sewing, a hem is a garment finishing method in which the edge of a piece of cloth is folded and sewn to pr
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4968161f25667341e816ee71bdd0ff252880d69a2df4cc89e5d8b2e27d360d. 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/8c1783f4-1eca-4eb2-b453-fdf37d31ac6e.json and https://artists.proofprofile.net/proofs/artist/8c1783f4-1eca-4eb2-b453-fdf37d31ac6e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f86a2831654cff2db2fdea5004cbf7279cd928211b66021aa528952bae17280. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAN110502135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cfbdc0fb49ffcfa775415877fbb19e71777b7f59ecc1ffa0dae319067545aa. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T03:58:19Z), 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/CAN110502137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b958e4fe61b8920e08424d0bd4e84d027619ab9b7fa5c01ca963abdf6e49b70. 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/CAN110502138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8242c76ad78ee40f90cd093edf4e1a10f2fdcd1f1029d2a1d9ff477d46aaf7b. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/CAN110502140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c73f60116a7a672a09a2eabcaeea62acdb374d2ee50ad92f2126d7823bd8a1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBBSR0200356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9fa9b733880238f0b8d7dc9979e1423dd11f38d1c55d3dbef3b482d493a5e1. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:49:25Z), 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/USR020424005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba84cb5815a19c58336ef818a6ff132d24023482a17c65efc0855aa8d2dad518. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CAN110502142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeee84f9dd1d1fd265de1c2aca8fe795acd4d99baab3bacdf1bae2ba343c78a4. 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/CAN110502143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0911832d6d26f8b15589d225c1b16b021fe17b8dc142dd302d1e5f4ce73c13dc. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/CAN110502145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733b802a9367e11fa3a3cda57fa29c91827f74857cc2a8e4ed2fc4e7ec5c6d6b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAN110502148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ef2bf05749db34f21aaedef11da9260ce0d5aa8b3a2f08c1aaaef6e820f628. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T02:46:50Z), 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/CAN110502152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf52ca59cde5e53c50e0ff1af3dc61721f0cc240b26d1236de74642afdcdd99. 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/CAN110502153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ef19e003114457a8ddc397e859aa9bf935ec01080f0d4009a386dd33d72fac. Chain 2 (Bitcoin): anchored in block 957852 (2026-07-13T11:25:45Z), 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/CAN110502154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a493a921baea1e03feae4c716181fc8ce41b74f252cebbb3dc6dc3a015ef647. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAN110502155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa17d9be11027c0791d7110ac46010f9d282d89fb8c8925fda6984fb8c19dff. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/CAN110502156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9812f4e80f090d6863b9b86631b35434c00675d1c6e14dd2cec27897bf7d487b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAN110601417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf1040c81e21e763af8fa948b3a392271bef38f5102e5ea74d5e7c80bcf8636. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:23:43Z), 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/CAN110601419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9a091710b77d904fb97f488ad828a800fa3a48d7aa10d837d3a3b00807814c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/CAN110700477.
Twelfth Night (Music from the Public Theater's 2009 Production)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694e4f78a69b3db14af591427523ad617e5ec398ee6f4a70ead89f84eed34171. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/CAN110900720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd407650c1fd35c104d11f3eef7dfcc418f84cdc639140d4cfa2f25a5134f51e4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMJQR1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd110c50fbfcbdb3a473b597a83799705f6ef9a3c158ce0f4d5199191e08f1255. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T17:24:58Z), 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/QMJQR1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5240f62fcb74e1b1562dc98b16dbdd944d9705dba01ee44122bb0c5508dfa3ae. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T15:48:40Z), 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/QMJQR1200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6349f19b5871c045fae5dac3a5d1396c3db1d77045a4dcd3658f685ba8bc4ff3. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QMJQR1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8faf702dfa832456373c6ca2ea875fa026f02a086ebf9246cd0be454e8182be. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMJQR1200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d4a1b67e4611fb741e00d21314a8ec71e9f433bc47b57b056f66c63fed197a. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QMJQR1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294bcd9b76625a95dd7a2811628148cfc87efcd22b9a9c227b4a7a0750f82fde. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US59U0410012.