Call It Off may refer to: Call It Off (band), Dutch pop punk band "Call It Off", a single from Ratchet by Shamir "Call It Off", a song from The Con by Tegan and Sara
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 0x414e3bbdb45c873faf19b295e791a4f48a93a4b83f68ee5d9963b470546c9411. 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/49ca04f7-3edd-4c7d-8f17-d34347facd35.json and https://artists.proofprofile.net/proofs/artist/49ca04f7-3edd-4c7d-8f17-d34347facd35.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 0xa954c041a7cc89203a3b4d45679cddd0bdd2d9b4f2a976ceaffe320bc2a09f8d. 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/NLAL61501001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf9fb46869cab22f8594f12fc8c4602cf5ece11f7252ca8652278f37b0bf420. 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/NLM9X1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f1e733faf581391f2b3e6a080f1d76ba587642c6d4e7bedff2b282b7c8f3e6. 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/NLM9X1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea3fe7af55b0db5731e010b4012851e1af69cd809001b54c3bef1d9d15df2c1. 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/NLM9X1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebf4b87592a872884c561d0a211ac8b7a59f2a07be05905b0aa1c6535d6b6e8. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NLM9X1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9fe38ab0044a6d99932b07730a0e34543a1c372dcfbf72036e4957f4df5f7b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLAL62415001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2361253a900537070a40d0f35f6a4eb0324617daa474534ed161d5a55be53c29. 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/NLAL61418001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f01d02475793777670d348c1044c849e8bbebfdb924e7be6c18aaf457094f3f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLAL62504001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f48491a05deb211fef403c213629d25d2c214dadbc53018c675db4e80ca19e. 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/NLAL62504002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09a0229b8cc7d1501960481f96998d54cd95a6f556e96a8748d0a691df40690. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/NLAL62306001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa42716a7b91fcda397048511a5ef94f915d8d41410fc93bfbd08a6ef117f02. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NLAL62404001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ac2d8353e6fb9d5fbef206a865bb8e5ba106d9f38ec0bd6c8f4a4082b608ee. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NLAL62409001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9fe38ab0044a6d99932b07730a0e34543a1c372dcfbf72036e4957f4df5f7b. 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/NLAL62415001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa476e2bc8af7389ee5f3e4037cf5e939d7895b81e0aa42f7633bd3b454e650f3. 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/NLAL62504005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6ded04764674a225a49ed3e7d0c3e9db0648b0f8ba8c6661eefb0a1788e595. 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/NLAL62318001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6464f4269a60c9fa86ba1bddb5162a0fe5011dbc31b12ca2acc6bca65f043552. 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/NLAL62311001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf641747639af8433a612fb32985bcd8c6dc3f2a25d184f39b0d84f197a9175d4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLAL62504007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02777eee5f94081c7f42633fb64cd8673db52ec8169c060314e3430ded71a10. 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/NLAL62504008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc704934b558c1cdb8b0e261ec8952aa78b02d1f7bd2e5818e1f636567b3dc7bc. 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/NLAL62504009.